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

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

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

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

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