Friend, I can not sketch / make a poster directly for you... However, I can give you some hints and ideas for the contents of the poster for "drive safely" or "safety on roads".
You may have a young man with a scooter/motor bike beside him entering the main gate of a house. His mother/wife/kid/sister/brother/father are standing on the ground between the house and the gate. A caption appears underneath: "Drive Yourselves Safely Home ! "
Part of another caption "Better to Reach Home Late .." appears under the picture.
You may have a person injured badly and bleeding. He sits on the road side. Or, a person is dead on the road in a pool of blood. The vehicle (scooter/car/motorcycle) is totally damaged.
A caption "or, Dial 0000 for Ambulance to drive you Home!"
Part 2 of the caption " than Never..." appears underneath.
"Safety Matters, as Life is Precious. "
"Safety First ! Destination is only Next !"
"Your Hurry, Causes All Others Worry !!"