In 2016 56% of Greater Brisbane travel to work was in a driver only vehicle. This suggests that short, narrow track (SNT) vehicles designed to carry only one or two people have the potential to reduce commute parking space requirements, congestion and transport energy consumption. (Short means short enough to angle park in a road that requires parallel parking for normal cars. Narrow means one passenger wide vehicles narrow enough to safely travel two abreast in a normal traffic lane.)
This post looks at what the maximum size of an SNT vehicle could be while still satisfying the above requirements. It also attempts to quantify some of the potential benefits. It was concluded that:
- The maximum size would be about 1.1×2.4m. This should be long enough to carry at least two adults with the passenger(s) behind the driver.
- 1.1m width is more than the width required to fit one person. This suggests that minimum width would be determined by stability considerations. (Electric SNT’s should have low centres of gravity because the batteries would be under the floor and motors at wheel level. Some SNT proposals have also had tilting cabins.
- In the short term, when only a few SNT’s would be on the road, SNT vehicles will deliver dramatic reductions in parking space and garaging requirements and small increases in road capacity. In the longer term, road capacity would be increased as more and more SNT’s actually travel two abreast in a single lane. (More than doubled if all wide cars were replaced by SNT’s.)