T-Bone (Intersection) Accident Fault & Claims in Indiana
T-bone crashes at Indiana intersections cause devastating injuries and complex fault disputes. Learn how liability is determined under Indiana's modified comparative-fault rule, what evidence proves your claim, and how to protect your right to compensation after a broadside collision.
T-Bone (Intersection) Accident Fault & Claims in Indiana
A driver runs a red light on US 31 in Carmel and slams broadside into a sedan making a protected left turn. The impact crushes the passenger compartment, trapping two occupants. According to the Insurance Institute for Highway Safety, side-impact crashes account for 23 percent of passenger-vehicle occupant deaths in the United States, and intersections are the epicenter. In Indiana—where high-speed arterials cut through Indianapolis, Fort Wayne, Evansville, and South Bend—T-bone collisions remain a leading cause of catastrophic injury and wrongful death. The question of fault in these crashes is rarely simple, and the stakes are enormous.
Why Intersection Collisions Are So Dangerous
T-bone accidents—also called broadside or side-impact crashes—occur when the front of one vehicle strikes the side of another, typically at a 90-degree angle. Unlike frontal collisions, where crumple zones absorb energy, the struck vehicle has only a door panel, a B-pillar, and perhaps a side airbag between the occupant and the intruding mass. The National Highway Traffic Safety Administration reports that side impacts result in higher rates of serious injury per crash than frontal impacts, particularly for occupants seated on the struck side.
Intersections amplify risk. Traffic converges from multiple directions, drivers juggle competing signals and sight lines, and speed differentials are high. A vehicle traveling 45 mph on a state route has minimal time to brake if another driver misjudges a gap or ignores a stop sign. The energy transfer in a perpendicular collision can shear seat mounts, fracture vertebrae, and cause traumatic brain injury even when airbags deploy.
Common Injuries in Broadside Crashes
- Traumatic brain injury from the occupant's head striking the door frame or B-pillar
- Chest and abdominal trauma from door intrusion and seatbelt loading
- Rib fractures and internal bleeding (spleen, liver rupture)
- Pelvic fractures and acetabular injuries requiring reconstructive surgery
- Cervical spine fractures and spinal-cord damage
- Lower-extremity injuries—femur fractures, knee dislocations—from door intrusion
These injuries often require multiple surgeries, prolonged inpatient rehabilitation, and months away from work. Medical expenses and lost wages compound quickly, making thorough documentation essential.
Who Is at Fault in a T-Bone Crash?
Traffic-Control Devices and Right-of-Way
Liability in intersection accidents hinges on right-of-way rules codified in Indiana statutes and municipal ordinances. The driver who violates a traffic-control device—running a red light, blowing a stop sign, or ignoring a yield sign—is typically at fault. Indiana law imposes a duty to obey official traffic signals and to yield when required.
When both directions have green lights and one driver is turning left, Indiana law requires the turning driver to yield to oncoming traffic unless protected by an arrow. A left-turner who misjudges the speed or distance of an approaching vehicle and causes a broadside collision bears primary liability.
At uncontrolled intersections—rural four-ways with no signals—the vehicle on the right has the right-of-way when two cars arrive simultaneously. The driver on the left who proceeds without yielding violates that rule.
The Role of Modified Comparative Fault
Indiana applies a 51 percent modified comparative-fault rule under IC 34-51-2-6. If you are found 51 percent or more at fault for the collision, you recover nothing. If your share of fault is 50 percent or less, your damages are reduced proportionally. For example, a jury might find that the red-light runner bears 85 percent fault but that you contributed 15 percent by speeding through a stale green light; your total award would be reduced by that 15 percent.
Insurance adjusters exploit this rule. They comb the police report for any mention of speed, distraction, or position in the lane, then argue that you share blame. A defense attorney may claim you had the "last clear chance" to avoid the crash, even when the other driver ran a red light. That is why independent evidence—traffic-camera footage, event-data-recorder downloads, witness statements—is critical.
Rear-End and Sideswipe Variants
Not every "intersection collision" is a classic T-bone. A driver who brakes suddenly for a yellow light and is rear-ended presents a different liability picture: Indiana follows a rebuttable presumption that the trailing driver is at fault. A sideswipe during a lane change in the intersection may involve comparative negligence if both drivers moved simultaneously.
Gathering Evidence After a Broadside Collision
The Police Report
Indiana State Police and local agencies document intersection crashes in a State Form 44039 (Indiana Crash Report). The narrative section describes each driver's account, identifies the traffic-control device, and may cite a driver for a moving violation. A citation for disregarding a traffic signal—IC 9-21-3-7—creates a powerful presumption of fault, though it is not conclusive in a civil case.
Request a copy of the report through the Indiana State Police Online Public Crash Portal or from the local agency. Obtain it within two weeks so your attorney can begin investigation while memories are fresh.
Traffic-Signal and Red-Light-Camera Data
Many Indiana cities—Indianapolis, Carmel, Fishers—operate red-light cameras at high-crash intersections. Even where enforcement cameras are not in use, municipalities maintain signal-phase logs that record when each direction had green, yellow, or red. These logs are discoverable in litigation.
Private security cameras at adjacent businesses often capture the intersection. A gas station, strip mall, or bank may have footage showing the light status and vehicle positions. Attorneys send preservation letters within 72 hours because footage is commonly overwritten every 7 to 30 days.
Event-Data Recorders and Telematics
Virtually all vehicles sold since 2013 have an event-data recorder (EDR) that logs speed, throttle position, brake application, and seatbelt status in the seconds before impact. An EDR download—performed by a certified technician with the manufacturer's proprietary tool—can prove the at-fault driver never braked or was traveling well above the speed limit.
Telematics systems (OnStar, Ford Sync, Progressive Snapshot) also record event data. Subpoena these records in litigation, because insurers rarely volunteer them.
Witness Statements
Eyewitnesses standing at a bus stop or waiting at the adjacent light may provide the clearest account of who had green. Obtain names and contact information at the scene; witnesses disappear quickly. Your attorney will take recorded statements and prepare affidavits for use at trial.
The Claims Process for Indiana T-Bone Accidents
Filing a Third-Party Liability Claim
You file a claim against the at-fault driver's bodily-injury liability coverage. Indiana requires minimum limits of $25,000 per person and $50,000 per accident—inadequate for serious T-bone injuries. If the other driver was working, their employer's commercial auto policy or general liability policy may provide higher limits.
The at-fault insurer assigns an adjuster who orders the police report, takes recorded statements, and reviews medical records. The adjuster will make a low initial offer within weeks, before the full extent of injury is known. Never accept an early settlement. Orthopedic injuries may require a second surgery; closed-head injury symptoms can worsen months later.
Uninsured and Underinsured Motorist Coverage
Indiana law—IC 27-7-5-2—requires insurers to offer uninsured/underinsured motorist (UM/UIM) coverage of at least $50,000 on every auto policy, and the offer can be rejected only in writing. If the at-fault driver has no insurance or carries only the $25,000 minimum, your UM/UIM coverage bridges the gap.
A UIM claim is triggered when the other driver's limits are exhausted. You present your case to your own carrier, which stands in the shoes of the at-fault driver. Insurers often dispute UIM claims aggressively, arguing that your injuries are not as severe as claimed or that liability is shared. Many UIM disputes proceed to arbitration or litigation.
Medical Payments and Health Insurance
Your auto policy's MedPay coverage (optional first-party benefit) pays medical bills up to the policy limit regardless of fault. Health insurance also covers treatment, but your health insurer may assert a subrogation lien against any settlement.
Under Indiana's Hospital Lien Act, IC 32-33-4, hospitals may file a lien within 90 days of discharge. These liens are subject to pro-rata reduction for comparative fault and, if necessary, must be reduced so you net at least 20 percent of the recovery after attorney fees and costs. Liens recorded outside the statutory window or without proper notice are unenforceable.
Presenting Damages
Your claim must quantify both economic and non-economic damages:
| Category | Examples |
|---|---|
| Economic | Past and future medical bills; lost wages; rehabilitation and therapy; prescription medications; modifications to home and vehicle |
| Non-economic | Pain and suffering; loss of enjoyment of life; emotional distress; disfigurement; loss of consortium (spouse's claim) |
Indiana imposes no cap on non-economic damages in ordinary negligence cases. A life-care plan prepared by a vocational economist and rehabilitation nurse documents future needs and costs, transforming initial low-ball offers into substantial demands backed by expert testimony.
Statute of Limitations and Claim Deadlines
Indiana law—IC 34-11-2-4—gives you two years from the date of the accident to file a personal-injury lawsuit. Miss that deadline and your claim is permanently barred.
For wrongful-death claims arising from a fatal T-bone crash, IC 34-23-1-1 imposes a two-year deadline measured from the date of death, not the date of the collision. If the decedent lingered in intensive care for weeks, the statute runs from the day they died.
Government defendants have shorter notice deadlines. If the at-fault vehicle was operated by a city employee (police cruiser, maintenance truck), you must provide written notice to the political subdivision within 180 days under IC 34-13-3-8. Notice to the State of Indiana must be given within 270 days. These are conditions precedent to filing suit, and missing them forecloses your claim.
Litigation: When Settlement Talks Fail
Filing the Complaint
Your attorney files a verified complaint in the Indiana circuit or superior court where venue is proper—typically the county where the accident occurred or where the defendant resides. The complaint alleges negligence (duty, breach, causation, damages) and attaches supporting exhibits: the crash report, medical records, wage-loss statements.
Discovery and Expert Testimony
Both sides exchange interrogatories, requests for production, and requests for admission. Depositions of the parties, witnesses, and expert witnesses follow.
Key expert witnesses in T-bone cases include:
- Accident reconstructionists who use photogrammetry, EDR data, and drag-factor calculations to determine speeds, impact angles, and point of impact
- Biomechanical engineers who correlate vehicle crush with occupant injury
- Traffic engineers who opine on sight-distance obstructions, signal timing, and compliance with the Manual on Uniform Traffic Control Devices
- Life-care planners and vocational economists for future damages
Defense experts challenge causation, claiming pre-existing degenerative disc disease or that your injuries would have occurred in any event.
Motions for Summary Judgment
The defense may move for summary judgment on liability, arguing that undisputed facts show you ran the red light or were 51 percent at fault. Your attorney opposes with affidavits and video evidence demonstrating a genuine issue of material fact for trial.
Trial
Indiana intersection-collision trials typically last three to five days. Opening statements frame the case; direct and cross-examination of witnesses follow; demonstrative exhibits—animations, enlarged photos of the intersection—are shown to the jury. Closing arguments synthesize the evidence.
The jury receives instructions on negligence, comparative fault, and damages. Deliberations can range from hours to days. The verdict form asks the jury to assign percentages of fault to each party and to itemize damages. If you are found 50 percent or less at fault, judgment is entered for the reduced amount.
Special Considerations for Intersection Crashes
Left-Turn Arrows and the "Permissive Yellow" Trap
Intersections with flashing yellow arrows permit left turns when oncoming traffic is clear. Drivers often misjudge closing speed, particularly at dusk when depth perception wanes. The left-turner bears the burden of proof that the turn was safe.
Obstructed Sight Lines
Overgrown vegetation, parked delivery trucks, or poorly placed signage can obstruct a driver's view of cross traffic. Municipal liability may attach if the city failed to maintain clear sight triangles as required by the Manual on Uniform Traffic Control Devices. Claims against a city or county are subject to the Indiana Tort Claims Act, IC 34-13-3, including the 180-day notice requirement and a $700,000-per-person / $5,000,000-per-occurrence cap.
Comparative Negligence and the "Stale Green" Defense
Defense counsel may argue that you drove through a "stale green" light—one that had been green so long a prudent driver would anticipate a change—and failed to cover the brake. While this does not excuse a red-light runner, it can shift a few percentage points of fault and reduce your recovery.
Pedestrians and Bicyclists in the Intersection
When a pedestrian or cyclist is struck in the crosswalk during a T-bone collision, multiple defendants may be liable: the driver who ran the light and the driver who swerved and struck the vulnerable user. Indiana law requires motorists to yield to pedestrians in crosswalks; failure to do so supports both negligence and potential punitive damages if the driver was texting or intoxicated.
Drunk Driving and Punitive Damages
If the at-fault driver was operating while intoxicated—IC 9-30-5 defines OWI as a BAC of 0.08 or more, or impairment by any substance—you may seek punitive damages. Indiana caps punitives at the greater of three times compensatory damages or $50,000, and 75 percent of any punitive award is paid to the state's violent-crime-victims compensation fund. Even a modest punitive award sends a deterrent message and may motivate settlement.
Dram-shop liability under Indiana law applies only when the alcohol provider had actual knowledge the patron was visibly intoxicated. Proving a bar or restaurant liable requires server testimony, receipts, and surveillance video showing obvious impairment.
Wrongful Death Claims
Fatal T-bone crashes—particularly those involving high-speed arterials or commercial vehicles—give rise to wrongful-death claims under IC 34-23-1-1. The decedent's personal representative (named in probate) files suit on behalf of designated beneficiaries: spouse, children, parents, or next of kin.
Damages in a wrongful-death action include:
- Loss of love, companionship, and guidance
- Loss of earning capacity (present value of future earnings, less personal consumption)
- Medical and funeral expenses
- Grief and mental anguish of survivors
Separate survival actions under IC 34-9-3-1 recover damages the decedent could have claimed had they survived: pain and suffering from injury to death, medical expenses incurred before death, and lost wages during that interval. Survival claims become assets of the estate.
Negotiating Maximum Settlement Value
Demand Packages
Your attorney prepares a comprehensive demand package: a narrative letter explaining liability and damages, the police report, EDR data, all medical records and bills, wage-loss verification, life-care plan, and day-in-the-life video showing how the injury affects daily activities. A compelling demand can prompt settlement at or near policy limits without litigation.
Mediation
Most Indiana courts require mediation before trial. A neutral mediator facilitates negotiation, shuttling between caucus rooms with offers and counteroffers. Settlement rates at mediation exceed 70 percent. Mediators with personal-injury experience understand the value drivers in T-bone cases and guide parties toward realistic resolution.
Policy-Limits Demands and Bad-Faith Claims
When your damages clearly exceed the at-fault driver's policy limits, your attorney sends a policy-limits demand with a short deadline. If the insurer refuses and you later obtain a judgment in excess of limits, the insurer may be liable for bad faith. Indiana law does not permit a direct bad-faith action by a third-party claimant, but the insured defendant can assign their bad-faith claim to you post-judgment.
What Not to Do After a Broadside Collision
- Don't leave the scene. Even if you feel uninjured, adrenaline masks pain. Call 911, exchange information, and wait for the police report.
- Don't admit fault. Saying "I didn't see you" or "I'm sorry" can be twisted into an admission.
- Don't give a recorded statement to the other driver's insurer without an attorney. Adjusters ask leading questions designed to undermine your claim.
- Don't sign a medical authorization. Insurers use blanket authorizations to trawl for pre-existing conditions unrelated to the crash.
- Don't delay treatment. Gaps in care allow the defense to argue your injuries are not serious or were caused by a subsequent event.
- Don't post on social media. Photos of you hiking or attending a wedding will be screenshot and used to argue you are not disabled.
Government Liability for Intersection Design
When poor intersection geometry, malfunctioning signals, or missing signs contribute to a T-bone crash, the responsible municipality or the Indiana Department of Transportation may be liable. Common defects include:
- Signal timing too short for cross traffic to clear
- Unwarranted signals that create a false sense of security
- Sight obstructions in the public right-of-way
- Inadequate signage warning of cross traffic
Claims against government entities fall under the Indiana Tort Claims Act, IC 34-13-3. Remember the 180-day notice deadline for political subdivisions and 270 days for the State. Damages are capped at $700,000 per person. Importantly, government defendants are excluded from Indiana's Comparative Fault Act, so common-law contributory negligence applies: any fault on your part can bar recovery entirely.
Intersection Accident Statistics in Indiana
The Indiana Criminal Justice Institute reports that in 2022, angle crashes—the category that includes T-bone collisions—accounted for approximately 20 percent of all injury crashes statewide. INDOT data show that signalized intersections on high-speed state routes (US 31, State Road 37, US 30) are persistent hot spots. The National Highway Traffic Safety Administration attributes 38 percent of urban-crash fatalities to intersection-related events, including broadside impacts.
These numbers underscore the need for aggressive safety countermeasures: leading pedestrian intervals, protected left-turn phases, red-light cameras, and roundabouts. When agencies fail to implement known solutions at documented high-crash locations, tort liability may follow.
Dealing with Insurers Who Deny Liability
Even when the police report cites the other driver for running a red light, insurers may deny your claim. Common defenses include:
- Conflicting statements: "Our insured says the light was yellow."
- No independent witnesses: "It's he-said, she-said."
- Comparative fault: "You were speeding and could have stopped."
- Pre-impact avoidance: "You had the last clear chance."
An attorney counters with subpoenaed traffic-signal data, EDR downloads, and expert accident reconstruction. Filing suit forces the insurer to defend under oath, and discovery often reveals facts the adjuster ignored.
Key Takeaways
- T-bone crashes cause disproportionately severe injuries due to minimal side-structure protection; head, chest, and pelvic trauma are common.
- Liability turns on right-of-way and traffic-control devices; the driver who violates a signal or fails to yield typically bears primary fault.
- Indiana's 51 percent modified comparative-fault rule reduces your recovery by your share of fault and bars recovery if you are 51 percent or more at fault under IC 34-51-2-6.
- Gather evidence immediately: secure the police report, locate witnesses, photograph the intersection, and preserve traffic-camera footage before it is overwritten.
- File your claim within two years under IC 34-11-2-4; government defendants require written notice within 180 or 270 days under IC 34-13-3-8.
- UIM coverage under IC 27-7-5-2 protects you when the at-fault driver is uninsured or underinsured; confirm you have at least the statutory $50,000 minimum.
- Expert testimony—accident reconstructionists, biomechanical engineers, life-care planners—is essential to prove liability and maximize damages in contested cases.
Connect with an Indiana Injury Attorney
Intersection collisions generate complex liability disputes, multi-party claims, and high-stakes negotiations. Insurance companies deploy teams of adjusters, investigators, and lawyers to minimize payouts. You need an experienced Indiana personal-injury attorney who understands traffic law, comparative fault, and how to prove damages through expert testimony and compelling evidence.
IndianaAccidentAid.com connects injured Hoosiers with attorneys who handle Car Accidents, Truck Accidents, Motorcycle Accidents, and Wrongful Death claims across Indianapolis, Fort Wayne, Evansville, South Bend, Carmel, Fishers, Bloomington, and Lafayette. The platform is free to use, and you are under no obligation. Most personal-injury attorneys work on a contingency basis—no fee unless you recover.
Do not let an insurance company pressure you into a low settlement while you are recovering from surgery. Get a case evaluation from an attorney who will fight for every dollar you deserve. Your two-year deadline is counting down; take the first step today.
Frequently asked questions
How long do I have to file a lawsuit after a T-bone accident in Indiana?
Indiana law gives you two years from the date of the collision to file a personal-injury lawsuit under IC 34-11-2-4. If the crash resulted in a fatality, the wrongful-death statute of limitations under IC 34-23-1-1 is also two years, measured from the date of death. If a government vehicle or employee was involved—such as a city bus or state maintenance truck—you must provide written notice to the political subdivision within 180 days or to the State within 270 days under IC 34-13-3-8 before you can file suit. Missing these deadlines permanently bars your claim, so consult an attorney immediately after the crash.
Who is at fault in an Indiana T-bone crash at a traffic light?
Fault hinges on which driver had the legal right-of-way, typically determined by traffic signals and signs. The driver who runs a red light, fails to yield on a left turn, or ignores a stop sign is usually found primarily at fault. However, Indiana applies a 51 percent modified comparative-fault rule under IC 34-51-2-6, meaning if you share any fault—for example, if you were speeding or distracted—your damages are reduced by your percentage of fault. If you are 51 percent or more at fault, you recover nothing. Investigators examine the police report, traffic-camera footage, event-data recorder downloads, and witness statements to reconstruct who had green and who violated traffic law.
What damages can I recover after a broadside collision in Indiana?
You may recover both economic and non-economic damages. Economic damages include past and future medical expenses, lost wages, rehabilitation costs, prescription medications, and modifications to your home or vehicle. Non-economic damages compensate for pain and suffering, loss of enjoyment of life, emotional distress, disfigurement, and loss of consortium (your spouse's separate claim for loss of companionship). Indiana imposes no cap on damages in ordinary negligence cases. If the at-fault driver was intoxicated, you may also seek punitive damages, capped at the greater of three times compensatory damages or fifty thousand dollars, with 75 percent paid to the state's victims fund.
Can I sue if the other driver ran a red light but I was speeding?
Yes, you can still file a claim, but Indiana's modified comparative-fault rule will reduce your recovery. Under IC 34-51-2-6, your damages are diminished by your percentage of fault—so if a jury finds you 20 percent at fault for speeding and the other driver 80 percent at fault for running the red light, your award is reduced by that 20 percent. Crucially, if you are found 51 percent or more at fault, you are barred from any recovery. Insurance adjusters will scrutinize the police report for any mention of your speed or conduct, so it is essential to gather objective evidence—event-data recorder data, traffic-camera footage, and expert reconstruction—to minimize your share of fault.
What if the at-fault driver in my T-bone crash has no insurance?
Indiana law requires insurers to offer uninsured and underinsured motorist coverage of at least fifty thousand dollars on every auto policy, and you can reject it only in writing under IC 27-7-5-2. If the other driver is uninsured, you file a claim against your own UM coverage. If they carry only the state minimum—twenty-five thousand dollars per person—and your damages exceed that, your underinsured-motorist (UIM) coverage makes up the difference. Your insurer stands in the shoes of the at-fault driver and may dispute liability or damages, so having an attorney negotiate or litigate your UIM claim is critical to recovering full value.
How do I prove the other driver ran a red light in Indiana?
Proof comes from multiple sources. First, obtain the police crash report, which may cite the at-fault driver for disregarding a traffic signal under Indiana law. Second, locate eyewitnesses at the scene—pedestrians, other motorists, or workers at nearby businesses—and ask your attorney to take recorded statements. Third, request traffic-signal phase data from the city or INDOT; many municipalities log which direction had green at the time of the crash. Fourth, review footage from red-light cameras or private security cameras at adjacent stores, banks, or gas stations. Fifth, download the event-data recorder from both vehicles to confirm speed and brake application. Combining these sources creates a compelling liability case.
What is the Indiana Hospital Lien Act and how does it affect my settlement?
Under IC 32-33-4, hospitals can file a lien on your personal-injury settlement to secure payment for emergency and inpatient treatment. The hospital must record a verified statement of the lien within 90 days of discharge and provide notice to you, your attorney, the liable party, and the Indiana Department of Insurance. Critically, hospital liens are reduced pro rata for comparative fault; if you are found 30 percent at fault, the lien shrinks by 30 percent. Indiana law also ensures that after attorney fees, costs, and Chapter 4 liens are paid, you net at least 20 percent of the gross recovery—liens must reduce proportionally to meet that threshold. Hospital liens are subordinate to attorney liens and do not attach to MedPay or disability benefits.
When should I hire a lawyer after a T-bone accident in Indiana?
Hire an attorney as soon as possible, ideally within the first week. Early retention allows the lawyer to send preservation letters to businesses and the city to secure traffic-camera footage before it is overwritten, interview witnesses while memories are fresh, and arrange for an independent accident reconstructionist to document skid marks, debris fields, and roadway evidence. Insurance adjusters often contact injury victims within days, seeking recorded statements and offering quick settlements that vastly undervalue claims. An attorney shields you from these tactics, handles all communication with insurers, and ensures you do not accept a settlement before the full extent of your injuries is known. Most personal-injury lawyers work on contingency—no fee unless you win.
Can I sue the city if a malfunctioning traffic signal caused my T-bone crash?
Potentially, yes, under the Indiana Tort Claims Act, IC 34-13-3. If the city or INDOT failed to maintain the signal, allowed vegetation to obstruct sight lines, or ignored a documented high-crash location, you may have a claim. However, strict procedural rules apply: you must provide written notice to a political subdivision within 180 days or to the State within 270 days under IC 34-13-3-8, and damages are capped at seven hundred thousand dollars per person and five million per occurrence. Critically, government defendants are excluded from Indiana's Comparative Fault Act, so common-law contributory negligence applies—any fault on your part can bar recovery entirely. These cases require early investigation and prompt notice to preserve your rights.
What is the difference between a T-bone crash and a sideswipe accident?
A T-bone collision occurs when the front of one vehicle strikes the side of another at a perpendicular or near-perpendicular angle, typically at an intersection. The impact is concentrated on the door and B-pillar, causing severe injuries because there is minimal structure between the occupant and the intruding vehicle. A sideswipe accident involves two vehicles traveling in parallel lanes where their sides scrape or collide, often during a lane change or merge. Sideswipes usually occur at lower closing speeds and glancing angles, resulting in less severe injuries and property damage. Liability in a sideswipe often turns on which driver failed to check blind spots or signal, whereas T-bone liability centers on right-of-way at the intersection.