I got one idea but I 100% your teacher or nobody will ever
attempt in this lifetime... U read it here first and no where
else... here goes...
Build a large conveyer belt (similiar to the ones u see at
Changi Airport) at Singapore's expressway. The purpose is to let
all types of vehicles to travel at the same speed thus reducing
traffic jams due to slower moving vehicles in front. By going at
the same speed for every vehicles, the time taken to reach another
destination will be faster compared to the current one. When they
about to reach their destination, they can just restart their
engines, signal, and move out of the conveyer belt.
This idea also deals with "tidiness" on the roads (if u think
traffic jams are like a messy table or a messy kitchen)
How's my idea? Not possible right. LOL.
But like I said, U seen it here first.
This is interesting. 
. Nice.