There is no (17)__________ that in recent years the number of motor vehicles on the road has increased significantly. This has (18)___________ to numerous problems such as rise in air pollution, a higher accident rate and, of course, far more (19)__________ congestion. Some argue that if public (20)__________ play a greater role, then some of these problems might be (21)__________. However, the current is unlikely to change in the near future (22)__________ certain actions are taken.