Self-driving cars have countless obstacles to contend with on the road, chiefly drivers who don't always act predictably -- or responsibly. There's inclement precipitation and wind to worry about, plus jaywalking pedestrians and zippy electric bikes and scooters. That's not to mention alleyways and busy intersections that no amount of Google Maps data can elucidate. Perhaps it's not surprising, then, that Ghost Locomotion, a stealthy startup headed by former Yahoo CTO and Pure Storage cofounder John Hayes, isn't tackling a full stack autonomous car platform just yet. Instead, it's honing in on the task that constitutes two-thirds of all miles driven in the U.S.: highway driving.

The Uber-owned self-driving truck startup hopes to market an aftermarket kit that will provide Level 4 autonomy – meaning a truck driver could nap while his rig barrels down the road. A link has been sent to your friend's email address. The Uber-owned self-driving truck startup hopes to market an aftermarket kit that will provide Level 4 autonomy – meaning a truck driver could nap while his rig barrels down the road.

Most car companies are remaking themselves into tech startups as they move toward offering fully autonomous self-driving vehicles. Yet thousands of tractors already use self-driving kits as do hundreds of tugs, lifts and trucks. Self-driving aftermarket kits are beginning to be offered in multiple markets. Cruise Automation just got acquired by GM for 1 billion. Up until now Cruise was known as the developer of a 16,000 aftermarket kit to turn select cars into self-driving cars.