Like someone said in the hnews comments, this might work for auto transmission but with manual gearing you've got people using engine braking on hills.

Also like stated in the article the colouring is going to be an issue and trying to see some green lights whilst the headlights are on (full beam fog lights perhaps too?) doesn't seem practicable to me.

I think they should have it so there's a type of "slow down" light that supplements the brake light for when your deceleration is from taking your foot off the gas.

This sure riled people up.

Risk Compension predicts that drivers would simply use this new information to drive more aggressively, negating any possible safety benefits.

I read the article and the next one comes up: "Mouse Sperm Structure Unveils Asthenozoospermia Mechanisms" and my co-worker was like wtf are you reading.

This will lead to people braking momentarily to slow down, and others turning in front of slowing down traffic.

Little benefit, but the cost of adding front brake lights would be passed on to the car buyers.