There are many proposed solutions to traffic congestion in metropolitan areas. one solution has been prove ineffective: in fact, it promotes more cars and drivers on the roads. which solution is it? a) automate the driving process itself. b) build more infrastructure including more roads, tolls, and car-pooling lanes. c) using wireless vehicle-to-vehicle communication, cars could talk to each other in an attempt to keep traffic flowing more smoothly. d) a smartphone app that works like a social network for drivers, combining online maps with updates from other drivers about traffic jams, road works and accidents.

Option B, Build more infrastructure including more roads, tolls, and car-pooling lanes.

Explanation:

When an infrastructure is built it allows more vehicle to go through it. It proves to be useful only for some time just after  the construction. However, in long run it again proves to be inefficient as efficient traffic management require efficient traffic planning and not construction of more infrastructure.

Also addition of infrastructure,  increases the vehicular population thereby adding more vehicles to already existing mismanaged traffic.

Hence, option B is the right answer

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