Highway Engineering
The walls which are necessary on the hill side of roadway where earth has to be retained from slipping is known as

parapet wall
breast wall
retaining wall
None of these

ANSWER DOWNLOAD EXAMIANS APP

Highway Engineering
Centre line markings are used

in roadways meant for two way traffic
to designate traffic lanes
to designate proper lateral placement of vehicles before turning to different directions
to indicate that overtaking is not permitted

ANSWER DOWNLOAD EXAMIANS APP