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When the car lands on the intersection between two blocks, it often counts as a crash for the car. For plastic tiles in particular, this is a huge issue, because in some maps (in particular, Royal maps), mappers often create landings on these plastic tiles, which are small, so there is a high chance of landing on an intersection.
A landing bug can cause the car to turn unexpectedly, or to bounce. There have been numerous Royal maps that have been unenjoyable and difficult to play because of this issue.
I have created a test map to give an example of a landingbug on plastic tiles. You just have to press forward to complete the map, but you will notice that the car turns when it should just go straight. There are more extreme examples of landinbugs, but this illustrates the basic and most common issue. To play the map go to:
Brimarine's Club > Landing Bug Demos