I'm looking for a movie about a group of people who are involved in a crash but they don't know they are. In the real word they're unconsious at the site of the crash. But this group of people are in limbo and their watches don't work and they're wandering round the city looking for people. At the end one guy starts jolting and he wakes up in this crash with paramedics round him and all the people he's just been with in limbo are all around him unconscious

It sounds like Inception