a point i would like to add, the come alot sign(with two small white towers with red roof) crash is weird, it took me a lot of time and test to discover it
i explain why :
i placed it like this : (====> : come a lot sign, * : crashy place)
=====>
*
*
at this places (*, looks like a diagonal)) , if u use fast camera spinning or look left/ right or rear window the crash happens
and there is a distance beeteween object and crashy places, (i removed all object from crashy place until crash dont happen anymore and finally found it !!!!
)