standing room
noun
- space for standing in a theatre, sports ground and other events
Wiktionary
noun
- Space in a public area, e.g. on public transport or at a sports or entertainment venue, for people to stand
“The bus was packed, and all standing room was taken.”
“The cars will have standing room so that they can handle heavy in-town traffic on the tunnel sections of the Metropolitan and Circle Lines between Finchley Road and Aldgate.”