I never had problems with the collision detection (flashing BRAKE), up until I drove a Fiat 500e recently. It seems to differ by make and model I guess.
That Fiat was insanely obnoxious though: It plays a very loud DING and flashes the entire dash red, even if you're going quite slow and can literally come to a complete stop with enough space between you and the car in front, just by taking your feet off the pedals and using regenerative braking.
I drove it once and I got that warning like five times. Never had it before with Ford, Opel, Renault, ...