While early models still might be a tad crash-prone, self-driving cars are coming. And they’ll eventually lead us to change our streets. Lanes, for example, will get skinnier once they don’t have to accommodate shaky human hands. Roads will also have to become “smart,” communicating instructions via embedded sensors rather than with more-traditional visual cues. Radio transmitters could take over right-of-way regulation from stoplights, and satellite pings could mark detours in place of signs. Engineers will also have to find new ways to manage construction zones along highways—car cameras have a hard time knowing which messages, from cones to hand signals to barricades, trump others. Some startups, such as UC Berkeley-born Hyperlane, have crafted novel proposals for highway upgrades like self-driving-only lanes. There’s not much time: By some estimates, fleets of robot taxis and buses could roll in during the next decade.