- A388 between A30 and A388 Woodra Rd, Cornwall excluding Isles of Scilly (Grid ref SX327840)
- A388 between A388 Wooda Rd and B3254, Cornwall excluding Isles of Scilly (Grid ref SX329850)
- A388 between A388/Exeter St and A388 St Thomas Rd, Cornwall excluding Isles of Scilly (Grid ref SX333847)
- A388 between A30 and A388/ Exeter St, Cornwall excluding Isles of Scilly (Grid ref SX336840)
- A388 between B3254 and Cornwall excluding Isles of Scilly boundary, Cornwall excluding Isles of Scilly (Grid ref SX341861)
- A388 between A3072 and A3072, Devon (Grid ref SS343036)
- A388 between B3362 and A30, Cornwall excluding Isles of Scilly (Grid ref SX346830)
- A388 between B3257 and B3362, Cornwall excluding Isles of Scilly (Grid ref SX347800)
- A388 between A388 Tavistock Rd and Cornwall excluding Isles of Scilly boundary, Cornwall excluding Isles of Scilly (Grid ref SX350844)
- A388 between Devon boundary and A3072, Devon (Grid ref SS354000)
- A388 between Devon boundary and A388 spur, Devon (Grid ref SX360848)
- A388 between A390 and B3257, Cornwall excluding Isles of Scilly (Grid ref SX360700)
- A388 between A30 and A388, Devon (Grid ref SX365850)
- A388 between A30 and A388, Devon (Grid ref SX365850)
- A388 between A388 spur and A30, Devon (Grid ref SX368852)
- A388 between A38(T) and A390, Cornwall excluding Isles of Scilly (Grid ref SX400610)
- A388 between A3072 and B3227, Devon (Grid ref SS400126)
- A388 between B3227 and A386, Devon (Grid ref SS449200)