Prospect Hill Interchange is a twice-proposed junction on the M6 near Preston.
When the Preston Bypass opened, a junction at Prospect Hill with an east-west route was mentioned in the opening brochure. Plans show a simple roundabout interchange at the site, with motorway links in either direction.
Sketch Map of 1969 North East Lancashire Project Study Report proposals
In 1969, the North East Lancs Development Plan wanted a fast route to the Calder Valley from the M6
. The M65
(as it later was built as) was to have recycled the original Preston Southern Bypass
and Belmont Link
plans, though with a larger interchange at Prospect Hill
. As the M61
was opening, the junction would need to incorporate that motorway, which would merge into the M6 just to the south at Blacow Bridge
. Stubs were made on the M61 for access to the new interchange, and the plan was to have a 4-level, partially free-flowing interchange at the site. The stubs were lost when the M61 was extended slightly as part of the widening of the M6
between J30-32 in 1995.
The 1973 plans to extend the M65 had one option (the Red Route) that would cross the M6 at Blacow Bridge, but all the other routes looked at meeting the M6 away from the M61 merge. Whilst most plans for Prospect Hill Interchange don't even show Cottage Lane, at least one plan shows Cottage Lane connecting to the 2nd level roundabout of Prospect Hill Interchange. If that had happened either the roundabout for this junction would have been given all-purpose status or Cottage Lane (a country lane) would have been given motorway status!