The map has several traffic issues, there is no traffic because the traffic lights are not long enough to let traffic though the points where they spawn into the map. You just need to change the last number of the traffic lights name to a larger one to make the light longer, as for the truck issue you have to edit the spawn points the name of the path is traffic 6 i think i just deleted all the vehicles that were spawning and added the ones i wanted. You can also move the path to accommodate larger vehicles such as trucks. You have to do all of this in the editor so you have to know your way around it.
On another note i like this edition better the map is more fun and the game doesn't crash half way through playing, it just needs some small edits.
Yeah It doesn't crash. But I don't know anything of programming