- A412 between A332 and B376, Slough (Grid ref SU977793)
- A412 between B376 and A4, Slough (Grid ref SU983794)
- A412 between A4 and Slough boundary, Slough (Grid ref SU990802)
- A412 between Buckinghamshire boundary and A4007 roundabout, Buckinghamshire (Grid ref TQ000814)
- A412 between Hertfordshire boundary and A412 split, Hertfordshire (Grid ref TQ030917)
- A412 between A412 Uxbridge Rd and M25, Hertfordshire (Grid ref TQ033939)
- A412 between A40 and Buckinghamshire boundary, Buckinghamshire (Grid ref TQ036899)
- A412 between M40 Jct 1 and M40, Buckinghamshire (Grid ref TQ038850)
- A412 between A412 Denham Way and Long Lane, Hertfordshire (Grid ref TQ039935)
- A412 between Long Lane and A404, Hertfordshire (Grid ref TQ050941)
- A412 between A404 Riverside Drive and A404 Chorleywoood Rd, Hertfordshire (Grid ref TQ056946)
- A412 between A404 and A4178, Hertfordshire (Grid ref TQ060947)
- A412 between A4178 and A411, Hertfordshire (Grid ref TQ105967)
- A412 between A411 and A41(T), Hertfordshire (Grid ref TQ108975)
- A412 between A41(T) and A405(T), Hertfordshire (Grid ref TL114000)