An alternative to keeping cars off the roads altogether in certain localities, is to simply restrict the road space available to them. For example, a road carrying two or three lanes of motorised traffic in both directions might be redesigned to provide one lane each way for private vehicles, with the rest of the space being taken up by transit lanes, cycle ways, expanded pedestrian areas or roadside planting. All cities introducing Bus Rapid Transit systems with dedicated lanes have done this. Another option is to turn the whole road into a shared transport zone, that is, an area with very low speed limits and less demarcation between pedestrian, cycle and vehicle space.