Automatic Emergency Braking is a federal requirement on all new US passenger vehicles starting in 2029 (NHTSA final rule), but the systems already on the road range from a low-speed camera that barely slows a city fender-bender to a full-speed radar array that stops a 4,500-pound SUV from highway speeds before you touch the pedal. At 40 mph — the posted limit on most US suburban arterials — roughly half the AEB systems sold before 2022 won’t brake autonomously for a pedestrian. Maximum intervention speed, sensor count, and pedestrian detection range are almost never on a window sticker.
Quick answer
Most AEB systems sold between 2018 and 2022 cap pedestrian detection at 25–37 mph — enough for a parking lot, not a 40 mph arterial. For pedestrian AEB that reaches 40 mph or higher with documented IIHS results: Hyundai/Kia FCA on the 2021+ Tucson and Ioniq 5/6 (50 mph), Subaru EyeSight Gen 4 on the 2023+ Outback and Forester (50 mph), Volvo City Safety on the XC60 and XC90 (43 mph), Toyota TSS 2.0 on the 2020+ Camry and Corolla Cross (45 mph). Camera-only systems — Honda Sensing base and Tesla without radar — lose detection accuracy in rain, direct sun, and low-light conditions where radar keeps working. Tesla’s radar removal in 2021 dropped the Model 3 from “Superior” to “Advanced” in IIHS pedestrian testing (IIHS, 2022).
Why sensor type and speed ceiling matter
The gap between a 25 mph and 50 mph pedestrian detection ceiling is not incremental. NHTSA crash data shows the majority of US pedestrian fatalities occur at speeds above 30 mph — exactly the zone where a 25 mph system fires a warning but won’t apply brakes autonomously. At 45 mph, a 1.5-second intervention difference translates to roughly 66 feet: the margin between a full stop and a ~28 mph impact. Sensor type sets that ceiling. Stereo cameras calculate depth from image parallax and lose confidence faster at distance; radar measures time-of-flight and stays accurate past 150 meters regardless of ambient light. Subaru Gen 3 and Gen 4 EyeSight run on the same chassis — the grille radar added in Gen 4 is what pushed the pedestrian ceiling from 37 to 50 mph, not a camera resolution change.
Specifications
| System | Models | Sensors | Vehicle AEB ceiling | Pedestrian AEB ceiling | Cyclist detection | IIHS pedestrian rating |
|---|---|---|---|---|---|---|
| Toyota TSS-P | 2016–2021 RAV4, 2018–2022 Camry (base), 2017–2020 Corolla | Camera + radar | 50 mph | 25 mph | No | Superior (marginal) |
| Toyota TSS 2.0 | 2020+ Camry, 2020+ Corolla, 2019+ RAV4 Hybrid | Camera + radar | 50 mph | 45 mph | Yes (day) | Superior |
| Toyota TSS 3.0 | 2023+ Crown, 2024+ Tacoma | Camera + radar | 80 mph | 45 mph | Yes (day/night) | Superior |
| Honda Sensing | 2016–2022 Accord, Civic, CR-V, Pilot | Camera only | ~62 mph | 40 mph (standing), 35 mph (crossing) | No | Superior |
| Honda Sensing 360 | 2023+ Pilot, 2023+ CR-V | Camera + 2 corner radars | 62 mph | 40 mph | Yes | Superior |
| Subaru EyeSight Gen 3 | 2015–2022 Outback, 2017–2022 Forester, 2020–2022 Legacy | Stereo camera only | 87 mph | 37 mph | No | Superior |
| Subaru EyeSight Gen 4 | 2023+ Outback, 2023+ Forester | Stereo camera + grille radar | 87 mph | 50 mph | Yes (day/night) | Superior |
| Ford Co-Pilot360 | 2021+ F-150, 2022+ Maverick, 2023+ Escape | Camera + radar | 80 mph | 37 mph | No | Advanced (F-150), Superior (Escape 2023) |
| Hyundai/Kia FCA 2.0 | 2021+ Tucson, Santa Fe, Sorento | Camera + radar | 112 mph | 40 mph | Yes | Superior |
| Hyundai FCA (Ioniq 5/6) | 2022+ Ioniq 5, 2023+ Ioniq 6 | Camera + radar | 112 mph | 50 mph | Yes | Superior |
| Volvo City Safety Gen 7 | 2022+ XC60, XC90, S60, V60 | Camera + front radar + 4 corner radars | 124 mph | 43 mph | Yes (day/night) | Superior |
| Mercedes Active Brake Assist | 2021+ C-Class (W206), 2024+ E-Class (W214) | Stereo camera + long-range radar (500 m) | 155 mph (E-Class) | 37 mph (C-Class), 50 mph (E-Class) | Yes | Superior |
| GM AEB Gen 3 | 2021+ Silverado, Sierra, Tahoe, Suburban | Camera + radar | 85 mph | 50 mph | No | Advanced |
| GM AEB Gen 3 (Escalade) | 2021+ Cadillac Escalade | Camera + 3 radars | 85 mph | 65 mph | Yes | Superior |
| Tesla AEB (camera + radar) | 2017–2021 Model 3, pre-2021 Model Y | 8 cameras + front radar | Not disclosed | Not disclosed | No | Superior |
| Tesla AEB (camera only) | 2022–2024 Model 3 / Y (North America) | 8 cameras, no radar | Not disclosed | Not disclosed | No | Advanced (regression from radar spec) |
IIHS ratings current as of 2023–2024 test cycles. Pedestrian ceilings reflect manufacturer published specs or third-party test data where official specs are not disclosed. Real-world performance varies with lighting, weather, and system sensitivity settings.
How each brand’s system is built differently
Toyota TSS-P vs TSS 2.0. TSS-P, fitted to 2016–2021 RAV4 and base-trim 2018–2022 Camry, caps pedestrian AEB at 25 mph. In IIHS testing the 2019 RAV4 left a 3.6 mph residual in the 25 mph scenario — passing, but barely. TSS 2.0 extended that ceiling to 45 mph and added daytime cyclist detection. The 2022 Camry XSE with TSS 2.0 stopped completely in all IIHS pedestrian tests. Both generations use the same camera-plus-radar hardware; Toyota rewrote the pedestrian object classification between them. TSS 3.0 on the 2023 Crown and 2024 Tacoma adds intersection AEB: it watches for pedestrians crossing the path during a left-hand turn, which TSS-P and TSS 2.0 both ignore.
Honda Sensing. Every current Honda Sensing fitment from 2016 through 2022 uses a single forward camera at the windshield base and no radar. Direct low-angle sun and windshield fogging affect it more than radar-paired systems. Honda’s spec sheet puts the activation window at 3–100 km/h (62 mph). On tow vehicles and motorcycles, the monocular camera can’t reliably resolve object width at distance — false triggers and missed detections both go up compared to stereo or radar setups. Sensing 360 on the 2023 Pilot and CR-V adds two corner radars and cyclist detection, neither of which the base system has.
Subaru EyeSight Gen 3 vs Gen 4. EyeSight Gen 3 pairs two cameras 11.5 inches apart in the windshield header and calculates depth from parallax — no radar. Close-range classification is solid; detection range is shorter than radar setups, and heavy rain or snow hits it harder — a practical issue for anyone running these cars in the northeast or mountain states. Gen 4, on the 2023 Outback and Forester, finally added a front grille radar alongside the cameras and widened the field of view from 40° to 120°. That pushed the pedestrian ceiling from 37 to 50 mph. The 2023 Outback returned 0 mph residual on all four IIHS AEB test scenarios (IIHS, 2023).
Ford Co-Pilot360 and the F-150 hood problem. Co-Pilot360 handles vehicle-to-vehicle AEB to 80 mph across F-150, Maverick, and Escape. On the 2021 F-150 XLT, IIHS found a 10.8 mph residual in the 37 mph pedestrian test — “Advanced” rather than “Superior” (IIHS, 2021). The F-150’s hood height physically limits what the windshield camera sees at the angle a short pedestrian presents at 37 mph approach. The 2023 Escape with identical sensors scored “Superior” on the same test. Ford addressed low-speed detection on the 2024 Mustang by adding a second short-range radar at the front bumper, cutting the minimum activation distance from 8 to 4 meters in city conditions.
Hyundai/Kia FCA and the left-turn gap. FCA 2.0 runs camera plus radar on the 2021+ Tucson, Santa Fe, and Sorento, and adds a sub-mode called Junction Turning. During a left turn across oncoming traffic, the system actively watches for vehicles and crossing pedestrians in the destination lane and brakes autonomously if needed. Left-turn crashes are among the most common fatal intersection scenarios in the US, and most AEB systems — TSS 2.0, Co-Pilot360, EyeSight — don’t touch it. On the Ioniq 5 and Ioniq 6, Hyundai moved the radar from the grille to the lower bumper fascia, picking up shorter targets at ground level. The Ioniq 6 returned 0 mph residual on every IIHS AEB scenario in 2023 testing (IIHS, 2023).
Volvo City Safety and head-on steering. Current City Safety uses four sensors — forward camera, front radar, and a corner radar at each end — and activates vehicle AEB from 4 to 200 km/h. On XC60 and S90, the system adds a head-on intervention mode: when it detects an oncoming collision, it steers toward the road shoulder while braking. None of the other systems in the table steer — they only brake. The 2023 XC60 scored 0 mph residual on the 50 km/h crossing pedestrian scenario, where most competitors still show 5–15 km/h when tested.
Mercedes Active Brake Assist. Mercedes pairs a stereo camera with a long-range radar rated to 500 meters — roughly double the detection distance of standard single-radar setups. At 75 mph, that gives about 8.7 seconds of lead time before a stationary target versus roughly 3.5 seconds for 200-meter systems. The E-Class (W214) caps vehicle AEB at 250 km/h; the C-Class (W206) stops at a more typical threshold. Pedestrian detection runs to 50 mph on the E-Class and 37 mph on the C-Class. The system has three driver-adjustable sensitivity levels through MBUX. Factory default is “Moderate.” On a used car, pull that setting up before assuming the system is factory-calibrated — previous owners sometimes knock it to “Late” after a false trigger and never change it back.
Tesla’s camera-only step backward. Tesla pulled the front radar from North American Model 3 and Model Y production in May 2021. IIHS ran the updated camera-only Model 3 in 2022 and measured a 7.3 mph residual in the 25 mph pedestrian scenario, dropping it from “Superior” to “Advanced” (IIHS, 2022). The camera-only setup also shuts AEB off below roughly 7 mph to reduce false positives, leaving parking lots and driveways unprotected. Most other systems stay active down to 3–5 mph. Tesla partially restored a front radar on the 2024 Model 3 (Project Highland) in Europe.
How to check
- Identify the exact generation, not just the brand name. “Toyota Safety Sense” on a 2019 Corolla is TSS-P. On a 2021 Corolla it’s TSS 2.0. The label is identical on the window sticker; the pedestrian ceiling is 25 mph in one case and 45 mph in the other. Check the owner’s manual section heading or run your VIN through NHTSA’s vehicle lookup at vpic.nhtsa.dot.gov.
- Find the pedestrian speed range specifically. The owner’s manual will list the activation window for Forward Collision Warning and AEB. Pedestrian detection is sometimes a separate entry with its own speed limits. If the manual only gives a vehicle-to-vehicle range, the pedestrian ceiling may be lower or the function may not exist on your trim.
- Check the sensitivity setting on any used vehicle. Mercedes (three levels via MBUX), Ford (Pre-Collision Assist Sensitivity), Cadillac (Alert Timing), and some Toyota models let the driver reduce AEB sensitivity. These settings persist through ignition off. A previous owner may have changed it after a false trigger and left it there.
- On Tesla: confirm radar or no radar. Check the door jamb build date. North American Model 3 and Model Y produced after May 2021 shipped without a front radar. Pre-May 2021 cars have one behind the front bumper center. The radar-equipped Model 3 earned “Superior”; the camera-only version scores “Advanced” — a 7.3 mph residual in the 25 mph test versus 0.
- Verify the warning tone before trusting the braking. Drive in normal traffic and confirm the forward collision warning fires audibly before you’d expect brakes. If it fires, the system is working end-to-end. Don’t attempt to verify autonomous braking by driving toward an obstacle — the test track setup that IIHS uses involves precise positioning and a soft collapsible target.
- Check IIHS by model year and trim, not just model name. A “Superior” rating on a 2023 trim does not carry over to 2021. IIHS publishes results by model year and sometimes by specific equipment package at iihs.org.
What goes wrong
Treating 25 mph pedestrian AEB as full coverage. TSS-P, base Honda Sensing, and most pre-2021 GM trucks cap pedestrian detection at 25–37 mph. That range handles slow parking lot scenarios. At 40 mph on a suburban arterial — where most US pedestrian deaths happen — these systems fire a warning but won’t touch the brakes on their own.
Camera-only systems in rain and direct sun. Honda Sensing base, Tesla camera-only, and EyeSight Gen 3 all lose detection accuracy in heavy rain, snow, and low-angle morning or evening sun. Toyota and Subaru put a warning on the dash when this happens. Honda Sensing on some model years deactivates without a visible alert. Radar-paired systems keep functioning through most precipitation — the radar signal passes through rain where camera optical path does not.
Sensitivity dialed down by a previous owner. A used car with AEB that feels sluggish to warn is often just set to low sensitivity. Pull up the driver assistance settings before assuming a sensor or software problem. On Ford: Pre-Collision Assist Sensitivity. On Mercedes: FCW/AEB response under Driver Assistance. On Cadillac: Alert Timing.
Vehicle AEB cuts out above the rated ceiling. Above 80–87 mph for most systems, autonomous braking stops. The forward collision warning continues, but the brakes won’t fire without driver input. Volvo’s 124 mph ceiling and Mercedes E-Class’s 250 km/h are outliers. If you drive I-15 or I-10 in Utah or Texas at posted limit, that ceiling matters.
Disabling AEB after a false positive instead of investigating. Overhead gantry signs, sharp pavement shadows, and low motorcycles trigger false braking events more often on first-generation camera-only systems. Drivers switch AEB off and leave it off. Toyota and Honda issued TSB software patches for documented false-positive patterns on early TSS-P and Sensing fitments — free at any dealer. Check for open TSBs before disabling.
Windshield replacements without recalibration. Every AEB system with a windshield-mounted camera needs static calibration after the glass is replaced — typically against a target board at a set distance, sometimes followed by a calibration drive at highway speeds. Shops that skip this step return a car with AEB faults or degraded detection range. If AEB errors appear after a windshield swap, the camera calibration wasn’t done, not the camera itself.
Sources
- IIHS — Automatic Emergency Braking ratings and test methodology
- NHTSA — AEB federal mandate and performance standards
- Toyota Safety Sense — system specifications by model year
- Subaru EyeSight — system specification and generation comparison
- Volvo Cars — City Safety technical specification, XC60 owner manual
