As explained above, Trapster is only as good as the information it provides – and that can only be as good as the information fed into it.
Certainly in the areas I’ve been to in the last week, Trapster has drawn a blank.
It’s a great idea for a Windows Mobile app, and really there is nothing else wrong with it – it’s quite usable, makes the best use of the available display area and is finger friendly.
The drawback of a lack of effective information making this app largely redundant can of course be overcome – simply use it instead as a standard journey planner... and stick to the speed limit.