The road to self-driving cars got a little more crowded Tuesday, as Mobileye ( MBLY ) announced it will partner with General Motors ( GM ) supplier Delphi Automotive ( DLPH ) to jointly develop off-the-shelf autonomous driving technology for automakers. The two companies announced they will co-develop "the market's first turnkey Level 4/5 automated driving solution," which carmakers could begin integrating into vehicles starting in 2019. Level 5 is totally self-driving, while Level 4 is close to complete autonomy. All the major automakers and a number of the largest tech companies are working to develop self-driving cars, mostly through joint ventures. This month, General Motors said it was testing self-driving cars in Scottsdale, Ariz. Last week, Ford ( F ) announced plans to have a fully autonomous car in five years.