
1. About Dual Carriageway & Single Carriageway. Dual carriage usually known as 2 ways 2 lane & Single Carriage usually known as 2 way 1 lane.
2. About Road.
-Unpaved Road = The road with no proper pavement.
-Rigid Pavement = The Concrete road.
-Interlocking Pavement = like puzzle block.
-Flexible Pavement/Asphaltic Concrete= usually known as Pre-Mix,Tarred road,Tarmic Road..
-Paver


3. About Barrier.
-Guard Rail
-Road Shoulder
-Wire Rope barrier
-Concrete Barrier
-Island
-Median
-Tranverse Bar/Speed Breaker
Just give this simple thing for this time.
