American safety regulators don't have rules determining how brake lights should work while regenerative braking is happening, leading to potential safety issues car auto cars
system was slowing the vehicle by 0.1g. It described this as a “slight but noticeable” amount of braking force.should stick with the Level 1 or Level 2 regenerative-braking modes and avoid using the stronger Level 3 and strongest i-Pedal modes,” recommended Jennifer Stockburger, the director of operations at Consumer Reports Auto Test Center.
“Federal Motor Vehicle Safety Standard No. 108 […] does not require the [brake] lamps to be activated at a specific level of deceleration,”spokesperson said. “The agency will be discussing these stop lamp issues with the respective manufacturers during their regularly scheduled meetings with NHTSA. NHTSA currently does not have any open rulemakings to establish a new requirement on this topic.”
Similarly, as a result of this testing, Consumer Reports found that Mercedes’ electric vehicles have some brake light issues of their own. It found that in “Strong Recuperation” mode, the brake lights turn off as the vehicle is coming to a stop. Although the brake lights illuminate as the vehicle starts slowing, when the vehicle slows to a speed of less than 5 mph they turn off. That may behas designed the vehicles to slow less aggressively at that speed, to smooth out the braking process. Although Mercedes says that its brake lights abide by all federal regulations, CR argues that they still pose a risk to safety.
“In the interest of safety, we think a vehicle’s brake lights should stay on while the vehicle is stationary—as if the driver has their foot on the brake pedal,” said Alex Knizek, CR’s head of auto testing. “This makes the car more visible to vehicles approaching from behind and indicates that the driver intends to remain stationary.”
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