Sure, but people are only limitedly altruistic (see the tragedy of the commons). If this system was free, then it should undoubtedly receive a huge uptake. But

Sure, but people are only limitedly altruistic (see the tragedy of the commons). If this system was free, then it should undoubtedly receive a huge uptake. But it's not free! So is there a way to encourage uptake without compulsion? Reduced insurance premiums could be one way. Are there others? Reduced car tax on vehicles with pedestrian-safety features installed?