alright, like trojan_56 said, waypoints are pointless... because you always build the shortest path for your cars... what i think should be implemented for the waypoints is to make them act like stoplights... meaning if the road ahead is a 2-way, and a car is comming from the opposite way, you should make the car stop at the waypoint (just like a stoplight in real life)
finished it.
other than the fact that it requires no strategy at all and you could win it with only the laser cannons - no upgrades required... it's a pretty simple game 4/5