SAN FRANCISCO: Apple has held talks with at least four companies as possible suppliers for next-generation lidar sensors in self-driving cars, evaluating the companies’ technology while also still working on its own lidar unit, three people familiar with the discussions said.

The moves provide fresh evidence of Apple’s renewed ambitions to enter the autonomous vehicle derby, an effort it calls Project Titan. The talks are focused on next generation lidar, a sensor that provides a three-dimensional look at the road.

Apple is seeking lidar units that would be smaller, cheaper and more easily mass produced than current technology, the three people said. The iPhone maker is setting a high bar with demandsfor a “revolutionary design”, one of the people familiar with the talks said. The people declined to name the companies Apple has approached. The sensor effort means Apple wants to develop the entire chain of hardware to guide autonomous vehicles and has joined automakers and investors in the race to find winning technologies.

Current lidar systems, including units from Velodyne mounted on Apple’s fleet of self-driving test vehicles, use laser light pulses to render precise images of the environment around the car. But the systems can cost $100,000 and use mechanical parts to sweep the laser scanners across the road. That makes them too bulky and prone to failure for use in mass-produced vehicles.

Apple’s interest in next-generation lidar sensors comes as it has sharply increased its road testing while bringing on key hires from Tesla and Alphabet’s Google.