|Location Map ( geo)|
|From:||Hemel Hempstead (TL047060)|
|To:||Milton Keynes (SP890403)|
|Distance:||16.7 miles (26.9 km)|
|Meets:||A4251, A414, A4147, A505, A4012, A418, A5, A421, A509, A5130|
|Former Number(s):||A414, B486, B488, A505|
|Old route now:||B440, B4034|
|Route outline (key)|
The A4146 is a cross-country A-road in the Home Counties.
The route starts at a roundabout on the A4251 (former A41) on the western edge of Hemel Hempstead. Heading east, it starts off surprisingly rural in character as it crosses the River Bulbourne and the Grand Union Canal. Buildings do then appear but there is still a grassed area on the right of the road as far as the next roundabout (Hemel's magic roundabout) on the A414 on the southern edge of the town centre.
The two roads cannon off each other and the A4146 continues northwards along a relief road. We lose the B487 at the first roundabout and the A4147 at the second. At one time, the road continued straight ahead, however in 2017 with the opening of the Dunstable bypass, this was downgraded to B class, becoming the B440.
We follow a modern alignment past a few roundabouts and go over the West Coast Main Line. At one roundabout we meet the A418 and then turn northwards and continue as D2 (this part of the bypass is about 15 years newer than the previous section). There are still a few roundabouts, however. We run parallel to the WCML as we bypass Stoke Hammond and reach a roundabout on the southern edge of Milton Keynes, where we turn right, back over the railway. The road narrows at the next roundabout and we continue across the fields to reach the A5, at one of the few at-grade roundabouts on this section of that road.
There's a multiplex north along the A5 to the next junction, a dumbbell GSJ, where we join the H10. Now dual once more, we cross a bridge over a lake and continue past an industrial estate (the home of Red Bull Racing). We start to pass housing and then turn northwards at the next roundabout onto the V11. We continue on, alternately passing industry and housing to a roundabout where we turn right onto the H6. The road ends at the next roundabout on the A509, with that road continuing ahead to meet the M1.
In 1922 the route from Hemel Hempstead to Leighton Buzzard was the B486, with the route from Linslade to Bletchley and north the B488. Part of the B486 – the section south of the then B487 – was upgraded to A4146, with the A4147 being created at the same time in 1934/35. Together they formed a loop of A road serving Hemel, which remained like that – with the B486, A4146 and A4147 all ending at the same junction, until the 1970s, when the B486 was upgraded to A4146, taking the road to Leighton Buzzard.
Around 1980, the A4146 was extended further – to the A422 in Milton Keynes. It took the B488 from Linslade to Bletchley, then along Watling Street to meet the A421 at Roman Roundabout. From there it went north along V7 Saxon Street to H9 Groveway, then north on V8 Marlborough Street to the A422. This route is similar to that of the B4034, though the latter skips between V7 and V8 on H8 Standing Way, rather than H9, owing to the A421's shifting one road further north.
When the A41 Kings Langley bypass opened, there was a link road meeting the old A41 (A4251) at the A4146 junction. This new link became A414, and the A414 and A4146 south/east of the Plough Roundabout switched routes, creating a cannon.
The Linslade and Stoke Hammond Bypass opened on 14 September 2007. The southern section of the road opened in the early 1990s with the A505 number; now all of this became the A4146.
As stated above, in 2017 the section between Hemel Hempstead and Leighton Buzzard was downgraded to B class again, becoming the B440.
|Image||Name||Classified Road(s)||Grid Reference||More Info||Map|
|The Plough Roundabout||A414||TL054063||Hemel's Magic Roundabout|
|Gadebridge Park Roundabout||A4147||TL050085|
|Kelly's Kitchen Roundabout||A5 • V4||SP893335|
|Caldecotte Roundabout||A5 (southbound carriageway's slip roads)||SP885351|
|Walton Park Roundabout||V10||SP896356|
|Browns Wood Roundabout||H10 • V11||SP903363||A4146 changes from the H10 to the V11|
|Walnut Tree Roundabout||H9||SP899372|
|Brinklow Roundabout||A421 / H8||SP898380|
|Fox Milne Roundabout||V11 • H6||SP887397||A4146 changes from the V11 to the H6|
|Northfield Roundabout||A509 • A5130 • H5||SP890403||A4146 ends here|