Ways which affect supply that can reduce road traffic congestion include: Increasing capacity at bottlenecks This can help reduce traffic congestion as road construction especially on motorways and other major roads can cause one or more lanes unusable thus creating the bottleneck effect which causes traffic congestion. REDUCING THE DEMAND. The most fundamental solution to congestion is changing land use patterns, both in the city and in the suburbs. AsEnrique Penalosa says, “Congestion is the signal that you need to expand public transit.” A high quality bus rapid transit system would provide a non-regressive alternative to using a car.