The people who have been trained to crash into bright neon yellow orange concrete bollards also crash into other things, often times killing people not in cars.

You wann make driving a car safer for everybody, including the people at the wheel, you give them narrow, twisty roads so they never get to a speed where they kill anybody, including themselves.

If drivers are so inattentive that they hit that they hit neon bollards they'll also hit pedestrians in the crosswalk right behind it. Better they fuck up their own car from their negligence than kill someone