1 Second After People: Car crashes occur worldwide almost instantly without people to drive them.
10 Minutes After People: The last working cars either stop or crash, and the mechanical engines will continue to run until the gasoline supplies run out.
2 Days After People: The gasoline supplies of cars run out, eventually stopping them from working any longer.
50 Years After People: Detroit, the city that once manufactured 15 million new cars each year, now sees the same cars decaying on the streets. The tires will have been deflated within 15 years, but the rubber and synthetics will last for centuries.
75 Years After People: Many of the cars will have decomposed to steel endoskeletons.