the large bus to richmond

I met my mates on the prearranged bus journey to Richmond yesterday, and it was the first time I have been on a bus for years, as l am not a bus wanker. Towards the end of the night, we luckily bumped into another mate who gave us a lift home in his car, which was a fine result and saved us extortionate taxi fares. However, four of us were crammed into his car (plus the driver), which drives on the same space as a bus, which had this much space.  How does this work?

Toodle pip