B4504 (Rickmansworth - Watford)
|Location Map ( geo)|
|Distance:||3.8 miles (6.1 km)|
|Met (1932):||A404, A41|
|Now part of:||A4145|
|Route outline (key)|
In the 1970s the entire road was upgraded to Class I status, becoming the A4145. A short section to the west of Watford town centre has since been pedestrianised and the eastern end of the road was unclassified at the same time as Watford High Street.