trên mặt đường 
on the (surface of the) road [ trên ] : in, on; aforementioned, above, over, throughout
[ mặt ] : (1) right; (2) face, surface, dial; (3) side, aspect
[ đường ] : (1) route, road, street, path, avenue, lane; (2) sugar
Most Common Compounds Set 1:
Most Common Compounds Set 2 :