Such brigading is unlikely to have a meaningful impact on the capacity of non-limited-access roads (e.g., the street grid of Manhattan). It might help the capac

Such brigading is unlikely to have a meaningful impact on the capacity of non-limited-access roads (e.g., the street grid of Manhattan). It might help the capacity of highways leading into a city from suburbs or exurbs, but I don't think you'd even practically achieve a 2x throughput bonus at best, and any extra capacity you might add would be meaningless so long as the capacity of the surface streets at the destination is insufficient to handle the extra load. Add in the extra load of deadheading of self-driving cars, and I strongly doubt that there is any meaningful traffic benefit and in fact there could well be extra traffic costs incurred... and that's before anyone accounts for the effects of induced demand!