When there is so much traffic on the roads, it is sometimes quicker to walk than to go by car.             

A During rush hours, walking gives me much more pleasure than driving in the heavy traffic.

B  It is faster to walk than to drive in the heavy traffic at certain time of the day.

C The traffic is always so heavy that you’d better walk to work; it’s quicker.

D There is so much traffic these days that it is more pleasant to walk than to drive.