Earlier this week, Apple's (NASDAQ: AAPL) self-driving car prototype was again spotted on public roads in California. However, there were some notable changes this time around: Apple has significantly increased the number of sensors that are mounted on the roof. There are now no less than six lidar sensors mounted on top of a massive array that is affixed to the top of the vehicle, supplemented by numerous cameras and radar sensors. The sensor suite looks similar to prototypes that were spotted in August.

MacCallister Higgins, the co-founder of Voyage, spotted the prototype and shared the brief clip on social media. Voyage is a start-up that is developing autonomous taxis, so Higgins knows a thing or two here.