[jedunnigan]

Don't bother with the laser, just drive down the street and pass a car with HID headlights that aren't pointed directly towards the ground. At least in that situation your response will be to slow down (and hopefully the people behind you will see your brake lights).

But if someone can manipulate a LIDAR signal to confuse the car into thinking the road ahead is clear when it is not, well then the attack becomes much different.