The parapet walls are usually required on the valley side of the roadway, in order to
A. retain the earth from slippage
B. properly guide the vehicles to the roadway
C. provide a good drainage system
D. keep the road dry
Answer:B
The parapet walls are usually required on the valley side of the roadway, in order to
A. retain the earth from slippage B. properly guide the vehicles to the roadway C. provide a good drainage system D. keep the road dry