That's a good question. My guess is that either the driver's vision will be quickly impaired or his/her eyes will quickly start hurting. In that case, the driv

That's a good question. My guess is that either the driver's vision will be quickly impaired or his/her eyes will quickly start hurting. In that case, the driver will quickly know something is wrong even if he/she may not know it's an attack. I'm no expert on laser safety or human biology, so I left a question on biology SE: http://biology.stackexchange.com/questions/38603/how-quickly-can-lasers-of-various-wavelengths-and-powers-impair-human-vision-or http://biology.stackexchange.com/questions/38603/how-quickly... Hopefully somebody can give an answer. And if the driver experiences no symptom, then the attack is just ineffective.