I did see someone on in-line skates holding onto a semi-truck at 96th St and Broadway the other day to catch a free ride... Didn't see their harpoon though.
If they're going to make people ride bikes and scooters in traffic, then it should at LEAST be legal to do the Snow Crash thing where you use a hook-shot-style harpoon to catch free rides from cars.
Our experimental aerogel iceberg with helium pockets manages true 100% efficiency, barely touching the water, and it can even lift off of the surface and fly to more efficiently pursue fleeing hubristic liners.