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Location Map ( geo)
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North Orbital Road
From:  Leavesden Green (TQ097997)
To:  Park Street (TL143050)
Distance:  4.8 miles (7.7 km)
Meets:  A41, A412, M1, M25, B4630, A414, A5183
Former Number(s):  A412
Old route now:  A412, M25, A414
Primary Destinations
Highway Authorities


Traditional Counties


Route outline (key)
A405 Maple Cross – Hunton Bridge
A405 Hunton Bridge – Waterdale
A405 Waterdale – Park Street
A405 Park Street – Hatfield
This article is about the North Orbital Road, near Watford and St Albans, Hertfordshire.
For the 1922 route, now A406 and A4005, see A405 (Gunnersbury Park - Wembley)
A405 North Orbital Road and Tippendell Lane roundabout

A new build 1930s road, the A405 North Orbital Road links the Watford bypass A41 at Leavesden Green to the A414 south of St Albans.

Starting at a grade-separated roundabout junction on the A41 Watford bypass, the A405 heads north-east then north to bypass Abbots Langley. Although the road is D2 speed is limited to 40 mph owing to the large number of side roads and occasional roundabouts. The limit increases to 50 mph before we reach the M1 at the Waterdale Interchange (Junction 6).

Now carrying traffic between central London via the M1 and the M25, the road passes to the west of Bricket Wood and soon reaches a roundabout at J21A of the M25. On the far side of the motorway – and still D2 – the road bears right at the next roundabout to bypass Chiswell Green and presently we reach Park Street Roundabout to the south of St Albans where we meet the former A5 (now A5183) and former M10 (now A414). The road ends here.


The A405 was originally planned to be part of an orbital road encircling all of London. The North Orbital Road was to be from the Colnbrook Bypass on A4 to Tilbury.

When first built in 1932 or 1933 it ran from the A41 Watford Bypass to the A555 (now A1) Barnet Bypass, west of Hatfield and passing to the south of St Albans. Contractor for the Chiswell Green to Barnet Bypass section was Sir Robert McAlpine and Sons, tender price £302,836.

In 1976 the road was extended westwards to bypass Rickmansworth and meet the A412 at Maple Cross.

The Rickmansworth bypass was upgraded and incorporated into the M25 in 1985 as the section between J17 and the spur at J19 (although the spur at J17 is now the A412). Later still, the St Albans bypass was incorporated into a rerouted A414, giving the road its current length.

Related Pictures
View gallery (16)
Park Street roundabout - Coppermine - 20937.jpgWaterdale Interchange.PNGApproaching Park Street roundabout - Geograph - 1994271.jpgTechmiracle Ultra LED heads - Coppermine - 16963.jpgPark Street motorway upgrade.png
Other nearby roads
St Albans
A400 • A401 • A402 • A403 • A404 • A405 • A406 • A407 • A408 • A409 • A410 • A411 • A412 • A413 • A414 • A415 • A416 • A417 • A418 • A419
A420 • A421 • A422 • A423 • A424 • A425 • A426 • A427 • A428 • A429 • A430 • A431 • A432 • A433 • A434 • A435 • A436 • A437 • A438 • A439
A440 • A441 • A442 • A443 • A444 • A445 • A446 • A447 • A448 • A449 • A450 • A451 • A452 • A453 • A454 • A455 • A456 • A457 • A458 • A459
A460 • A461 • A462 • A463 • A464 • A465 • A466 • A467 • A468 • A469 • A470 • A471 • A472 • A473 • A474 • A475 • A476 • A477 • A478 • A479(W) • A479(E)
A480 • A481 • A482 • A483 • A484 • A485 • A486 • A487 • A488 • A489 • A490 • A491 • A492 • A493 • A494 • A495 • A496 • A497 • A498 • A499
Defunct Itineraries & Motorways: A403 • A404(M) • A405 • A407 • A423(M) • A430 • A437 • A446(M) • A455 • A464 • A475 • A491

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