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by k_sze 3935 days ago
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...

Hopefully somebody can give an answer.

And if the driver experiences no symptom, then the attack is just ineffective.