Reasons car go bust on speed humps:
-poor workmanship and crappy parts, original or otherwise
-constantly bouncing over speed humps, as stated then there is one hump to break the camels back.
-Hitting a speed hump way to first.
It is amazing how many people complain about speed humps but the speed I see some going over them it is no great surprise cars get damaged. The amount of times I have gone down a road on my own with speed humps to then look up and there is a car on my tail, how fast do some people go over these things. So many drivers think they are not going that fast but they are, in 20 years plus of driving and umpteen cars of varying stanard I have never damaged my car as I treat humps with the respect for the reason they are put there for and of course my own car.
I find it almost hilarious how modern 4x4s can be damaged in such a way, even when they are supposed to tackle and handle tough terrain. What does that tell people
Of course this doesn't go for everyone but if cars kept to the limit in key pedastrian areas, they wouldn't be required.