It was one of the first major new roads constructed for use by motor traffic, and was designed as an unemployment relief project.

[1] It runs roughly northwest to southeast from the Wolverhampton Ring Road via Dudley to Harborne, west Birmingham.

[4] It provided jobs for at least 470 unemployed workers in surrounding areas including Birmingham, Wolverhampton, Dudley, West Bromwich, Smethwick and Oldbury.

[5] It was opened by the then Prince of Wales (later Edward VIII of the United Kingdom) on 2 November 1927.

[7] National Express West Midlands services 8 and X8 serve the majority of the A4123 from Wolverhampton to Dudley while National Express West Midlands service 126 serves the section from Dudley to Birmingham (Hagley Road).