Last Saturday, PY and I went to St Albans to meet some friends. While we were there we went to the Roman theatre of Verulamium (which, I am reliably told was found in 1847).
Built in about 140AD it is the only example of its kind in Britain, being a theatre with a stage rather than an Amphitheatre. Initially, the arena would have been used for anything from religious processions and dancing, to wrestling, armed combat and wild beast shows. From about 180AD the stage came into greater use and the auditorium extended. By about 300AD, after some redevelopment work, the Theatre could seat 2000 spectators. [Source]
The sign amused me – I got to imagining lots of chariots rushing past with urgent messages from the Emperor at some distant end of the road until I was reminded it was a thoroughly modern sign aimed at us!