Cheap amber gadget would save lives on Canadian highways

Back up lights, raised brake light.
Cars in the fifties didn't have them.

Brake lights and turn signals have been around forever.  Then came backup lights followed by a bonus brake light mounted in the back window. Now add an amber light that comes on when you lift your foot off the gas.  On a hill it may mean you're coasting but in heavy traffic it means you are on high alert making decisions.   Give a heads-up to the driver behind so they can be alert and prepared to take action too.  It's like the stress-free flashing amber lights at BC intersections warning you the green light is about to change to amber.   Ontario doesn't go for them and it's a lot dicier knowing when to stop safely.

It's easy to add a bit of amber.
Just do the same to the rear window brake light.

This is a cheap upgrade to improve communication among drivers and save lives.
While you're at it, how about Ontario beefing up those flashing amber warning signs?