If it extends across your vision plane, replace immediately. That's a hazard, and it will likely draw a quick ticket from the first cop who sees you.
Not necessarily; I got pulled over Saturday night and he didn't even mention the crack.
He did, however, toss my ass in jail for an old traffic warrant I'd forgotten about. (Expired insurance, had moved and didn't get the renewal notice in time, then they sent the ticket reminders to the address that was on the old insurance card.)
Avoid the Parker County jail if at all possible. Even the "connoisseurs of incarceration" I was in the holding cell with said it was the crappiest they'd been in other than some dirt poor border counties. Also, memorize the phone numbers of at least three people you know will take a collect call from you any time day or night, and give them a list of all the other people you might want to call if something happens. Took me six hours to get anyone to answer either of the two numbers I could remember off the top of my head, (other than my ex wife's number - I'd have sat it out to the last penny and risked losing my job rather than give her the chance to gloat) and then had to call her back after she'd dug up my lawyer's number and mom's cell phone number.
