The iCar might rely on special features in the full roads to provide some level of automated steering. I've considered some passive "beacons", shaped as nails,

The iCar might rely on special features in the full roads to provide some level of automated steering. I've considered some passive "beacons", shaped as nails, to be placed in roads, that can outline the lanes, complete with information about direction, speed-limits, exits etc. A smart car should be able to use those, along with a (ra|li)dar, to provide automated steering on equipped roads.