British Standards Document
BS 505
Specification for road traffic signals

https://doi.org/10.3403/00084677U

BS 505 is maintained by EPL/526. The current release of this standard is:

BS 505:1971 Specification for road traffic signals

https://doi.org/10.3403/00084677 (published 12/10/1971)

This standard is available from the following sources:

Other historical versions of this standard document also exist:

BS 505:1937 [current until 18/09/1939]
BS 505:1933 [current until 23/08/1937]