Gallery:A405

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A405
 
 
A405 North Orbital Road and Tippendell Lane roundabout.jpg
Chiswell Green: A405 North Orbital Road & Tippendell Lane roundabout
Park Street roundabout - Coppermine - 20937.jpg
Park Street roundabout

What is the number of the road to the right? Two of the three numbers are unbracketed. This is the A5183 approaching the junction from the north - the sign on the A405 approach has a similar treatment.

Originally uploaded to Coppermine on Dec 06, 2008 by t1(M)
M25 Motorway, Chandler's Cross - Geograph - 92342.jpg
M25 Motorway, Chandler's Cross
Viewed looking south westwards from the Chandler's Lane overbridge.
Leavesden Green- A41 North Western Avenue - Geograph - 66236.jpg
Leavesden Green- A41 North Western Avenue
Approach to the A41/ A405 junction viewed looking westwards towards the Hunton Bridge roundabout from the Ashfields overbridge.
M25 Motorway Link Road, Chandler's Cross - Geograph - 92339.jpg
M25 Motorway Link Road, Chandler's Cross
This is the spur road leading to Junction 19 of the M25 Motorway from the Hunton Bridge roundabout, viewed looking westwards from the Langleybury Lane overbridge. Traffic is usually stationary westbound on this stretch during the weekday morning rush hour, but the road is virtually deserted on a Sunday morning. This particular road existed as the A405 trunk road, by-passing Watford, for many years prior to the M25 being built, and the route of the A405 was also incorporated into the motorway from Junction 19 to Junction 17 at Maple Cross. The distant dark triangular shaped structure is the gantry holding a conveyor belt crossing the road, associated with the numerous gravel pit workings in the vicinity.
Waterdale Interchange.PNG
Waterdale Interchange as it is today
North Western Avenue - Geograph - 1834136.jpg
North Western Avenue
The A41, looking west at its junction with Kingsway North Orbital Road A405.
Approaching Park Street roundabout - Geograph - 1994271.jpg
Approaching Park Street roundabout
Pegasus crossing command button - Coppermine - 9539.JPG
Pegasus crossing command button

On the A405 at Bricket Wood, Watford-bound.

Originally uploaded to Coppermine on Dec 17, 2006 by horsetan
Alu Star overhead - Coppermine - 9541.JPG
Alu Star overhead

On the A405 at Bricket Wood, Watford-bound, at dusk

Originally uploaded to Coppermine on Dec 17, 2006 by horsetan
Techmiracle Ultra LED heads - Coppermine - 16963.jpg
Techmiracle Ultra LED heads

...using FuturLED inserts. These have only just replaced the former Peek Elite incandescent heads on the A405 Pegasus crossing at Bricket Wood. First time I have seen the Ultra head in use. The AluStar heads remain in operation on the overhead mast-arms. Pic taken using Nokia 6233 mobile, at full 2.1mp resolution; sorry about pic quality!

Originally uploaded to Coppermine on Feb 16, 2008 by horsetan
London Colney Roundabout.png
How London Colney Roundabout could have looked if an alternative plan to complete the northwest section of the M25 was chosen. This option upgraded the A405 and A6 online between Park Street Roundabout and Bignells Corner.
London Colney offline upgrade.png
Alternative plan from the 1970s to complete the northwest section of the M25 with the motorway running parallel to the A405 between Park Street Roundabout and London Colney Roundabout before merging into the A6 towards Bignells Corner.
Park Street motorway upgrade.png
How Park Street Roundabout could have looked if an alternative route for the M25 was chosen in the 1970s. One of the options was for the motorway to closely follow the A405 and A6 between Park Street Roundabout and Bignells Corner. The M10 would have provided M1 to M25 east movements and there would have been a short section of D4M motorway immediately west of Park Street Roundabout where the M25 merges into the M10 to cater for the additional traffic on the weaving section. There would have been no east facing slips at the roundabout and traffic heading east would use the existing A405. There is however an exit slip westbound from the M25 to the A405. All road numbers shown are from the period. A5 is now A5183 and A405 east of A5 is now A414.
Park Street grade separation.png
Basic grade separation of Park Street Roundabout as one of the proposals for completing the northwest section of the M25 in the 1970s. Some of the options maintained the M10-A405-A6 route for movements between the M1 and M25 east. In this case all the junctions would have been grade separated to provide a freeflow route throughout.
Park Street with M10 A405 merge.png
An online upgrade of the A405 and A6 between Chiswell Interchange and Park Street Roundabout was one of the proposals in the 1970s for completing the northwest corner of the M25. The road however would have been all-purpose although the report states that a motorway would be possible. It would have resulted in flyovers for the A405 and M10 which would have merged above the roundabout making it a three level junction. The route would then be on a new alignment between there and London Colney Roundabout with the existing A405 being used for eastbound traffic joining at the roundabout since there are no east facing slips to the new alignment from the roundabout.

 

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