The Peel P50 three-wheeled microcar, which is the smallest production automobile in the world, certainly won't stop the GTA V train, but it's pretty much good for everything else.
Traffic jams are no longer a problem. There's no need to get out of the car at home and since it's smaller than shrub hedges, and we can hide anywhere with it.
Taking a corner won't be easy though. This GTA V model of the car by modder popos1 is no exception: