- A505 between A418 and LA boundary, Central Bedfordshire (Grid ref SP905235)
- A505 between LA boundary and Buckinghamshire boundary, Buckinghamshire (Grid ref SP911233)
- A505 between LA boundary and A4146, Central Bedfordshire (Grid ref SP920234)
- A505 between A4146 and A5, Central Bedfordshire (Grid ref SP960231)
- A505 between A4012 and A505, Central Bedfordshire (Grid ref TL014223)
- A505 between A5 and Station Rd, Central Bedfordshire (Grid ref TL020219)
- A505 between Station Rd and A5065, Central Bedfordshire (Grid ref TL030220)
- A505 between A5065 and M1, Luton (Grid ref TL049226)
- A505 between M1 and A5228, Luton (Grid ref TL059226)
- A505 between M1 and A5228, Luton (Grid ref TL060226)
- A505 between A5228 and A6, Luton (Grid ref TL077221)
- A505 between A5228 and A6, Luton (Grid ref TL079220)
- A505 between A6 and Castle St roundabout, Luton (Grid ref TL089210)
- A505 between Castle St roundabout and A6, Luton (Grid ref TL096210)
- A505 between A6 and Kimpton Road Roundabout, Luton (Grid ref TL098210)
- A505 between A6 and Luton boundary, Luton (Grid ref TL100208)
- A505 between A1081 and Luton boundary, Luton (Grid ref TL104202)
- A505 between A5228 and Mount Grace Rd, Luton (Grid ref TL105240)
- A505 between A505 and LA boundary, Central Bedfordshire (Grid ref TL107202)
- A505 between Eaton Green Rd roundabout and A5228, Luton (Grid ref TL110218)
- A505 between LA boundary and Kimpton Rd roundabout, Luton (Grid ref TL110205)
- A505 between Kimpton Rd roundabout and Eaton Green Rd roundabout, Luton (Grid ref TL110214)
- A505 between Mount Grace Rd and Luton boundary, Luton (Grid ref TL110247)
- A505 between Hertfordshire boundary and B655, Hertfordshire (Grid ref TL165284)
- A505 between A505 Old Park Rd and A600, Hertfordshire (Grid ref TL180295)
- A505 between B655 and A602, Hertfordshire (Grid ref TL180290)
- A505 between A602 and Bedford Rd, Hertfordshire (Grid ref TL181293)
- A505 between A602 and Old Park Rd, Hertfordshire (Grid ref TL182293)
- A505 between A600 and B656, Hertfordshire (Grid ref TL190297)
- A505 between B656 and Stotwold Rd/Queenswood Drive, Hertfordshire (Grid ref TL200302)
- A505 between Stotwold Rd/Queenswood Drive and A6141, Hertfordshire (Grid ref TL223320)
- A505 between A6141 and A6141, Hertfordshire (Grid ref TL239335)
- A505 between A1(M) and Baldock Roundabout, Hertfordshire (Grid ref TL241312)
- A505 between A6141 and A507, Hertfordshire (Grid ref TL245340)
- A505 between A507 and Baldock Rd (non-A505), Hertfordshire (Grid ref TL327400)
- A505 between Baldock Rd roundabout and A1198, Hertfordshire (Grid ref TL350420)
- A505 between A1198 and A10, Hertfordshire (Grid ref TL360424)
- A505 between A10 and Hertfordshire boundary, Hertfordshire (Grid ref TL370412)
- A505 between Cambridgeshire boundary and B1368 Barley Rd, Cambridgeshire (Grid ref TL400425)
- A505 between B1368 Barley Rd and M11, Cambridgeshire (Grid ref TL450455)
- A505 between M11 and A1301, Cambridgeshire (Grid ref TL470469)
- A505 between A1301 and A11, Cambridgeshire (Grid ref TL500480)