While driving city streets at a maximum speed of 55,on sunday 4/2/17, my windshield must have been hit by a small stone. i did not notice when it happened. on monday, 4/3/16, i noticed a small mark on the windshield which i mistook for a bug. i later noticed a small line coming from the "bug" which i mistook for fluid. by tuesday, 4/4/17, there were "lines" in both directions and i realized that i had a cracked windshield. by wednesday, the crack was 16" in length. i took my car to toyota service and was told that they were not responsible under warranty; this is something that was caused by "impact". the car has 8400 miles on it. my concern is with the quality of that windshield. if a small pebble can cause that much damage, it seems to me that this is an inferior product. i have driven for 49 yrs in different climates, through blizzards, hailstorms, and had flying debris hit my windshields. i have had fender benders and been rear-ended. never have i had a broken windshield. a windshield that is this delicate is a safety issue. it seems to me, that in this world of profit-driven choices, that the windshields are being made cheaper, and therefore less effective in terms of protection. i wonder what would have happened if it were more than a pebble that flew at my car. in ca, it is illegal to drive with a cracked windshield. so now i am in the predicament of getting this fixed immediately. handily for toyota, they won't replace it gratis, so it is a nice $1,300.00 repair job for them. they pleasantly advised me that my insurance would cover the $800.00 overage of my $500 deductible. with the issue at hand being my safety and compliance with the law, i have little choice. cheap windshields must create a regular base of repair work for all the automakers who use this particular auto glass. this should be seriously considered in terms of vehicle safety.