M-23 (Michigan highway), a highway designation formerly used in Michigan
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The M23 was planned as a means of relieving congestion on the A23 through Streatham, Thornton Heath, Purley and Coulsdon in south London and was originally intended to terminate in Streatham Vale at a junction with the London Ringways Plan's Ringway 2 (the intended replacement of the South Circular Road (A205)).
The M23 plan was gradually scaled back further to omit the section across Mitcham Common and end the motorway unsuitably on Croydon Road (A232) before the plan was postponed indefinitely.