The 609

Today the man in front of me sat sideways. I pretended to fall asleep so as to avoid eye contact.

On the way home a lovely young lady asked me why the bus changes from a 309 to a 609 after seven (it's because the service is provided with the assistance of the local authority as the service would be uneconomical without these grants, all busses numbered between 500 and 999 in the former Avon (South Gloucestershire, Bristol City Council and B&NES) are funded like this) I said I did not know.