M1 motorway: the end (according to OS One Inch 7th Series mapping)

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Clearway
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M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by Clearway » Tue Jun 30, 2020 12:34

According to the OS one inch map of 1968 (sheet 160, major roads rev. 1967; see Sabre maps) the M1 has a rather unusual termination at its southern end in Mill Hill. The motorway heads southeastwards alongside the Midland main line, then swings to the east to pass under the A1, about 3/4 mile southeast of Mill Hill station, turns sharply back to the south and west to form what looks like a T-junction with the A1. The curves look impossibly tight and if it was a T-junction, it seems a rather abrupt end to a motorway. Was the junction traffic light controlled or was there a tiny roundabout? Or was this just some mis-mapping by OS? On the next edition (1970, major roads rev. 1969-70; not yet on Sabre maps) there is a proper flow-separated junction between the A1 and M1.

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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by Chris Bertram » Tue Jun 30, 2020 13:07

Clearway wrote:
Tue Jun 30, 2020 12:34
According to the OS one inch map of 1968 (sheet 160, major roads rev. 1967; see Sabre maps) the M1 has a rather unusual termination at its southern end in Mill Hill. The motorway heads southeastwards alongside the Midland main line, then swings to the east to pass under the A1, about 3/4 mile southeast of Mill Hill station, turns sharply back to the south and west to form what looks like a T-junction with the A1. The curves look impossibly tight and if it was a T-junction, it seems a rather abrupt end to a motorway. Was the junction traffic light controlled or was there a tiny roundabout? Or was this just some mis-mapping by OS? On the next edition (1970, major roads rev. 1969-70; not yet on Sabre maps) there is a proper flow-separated junction between the A1 and M1.
It's a bit of a simplistic representation of what was there, remnants of which are still in place. If you look at the OS 1:25000 (Explorer) scale, you can see, in white, an old slip road leaving the motorway, curving under A1 and joining it at an angle, permitting only southbound continuation. There was a corresponding NB slip road, the stub of which is also visible on the map, leaving A1 to join the incomplete motorway. All motorway traffic had initially to use these slips, though later on the flyover from A1 Great North Way was opened. When the motorway was opened to Brent Cross, the slips were closed, the SB one being retained for emergency use, though how often it's been needed I don't know. It's barriered off at both ends, to the best of my knowledge.
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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by c2R » Tue Jun 30, 2020 14:14

Chris Bertram wrote:
Tue Jun 30, 2020 13:07
Clearway wrote:
Tue Jun 30, 2020 12:34
According to the OS one inch map of 1968 (sheet 160, major roads rev. 1967; see Sabre maps) the M1 has a rather unusual termination at its southern end in Mill Hill. The motorway heads southeastwards alongside the Midland main line, then swings to the east to pass under the A1, about 3/4 mile southeast of Mill Hill station, turns sharply back to the south and west to form what looks like a T-junction with the A1. The curves look impossibly tight and if it was a T-junction, it seems a rather abrupt end to a motorway. Was the junction traffic light controlled or was there a tiny roundabout? Or was this just some mis-mapping by OS? On the next edition (1970, major roads rev. 1969-70; not yet on Sabre maps) there is a proper flow-separated junction between the A1 and M1.
It's a bit of a simplistic representation of what was there, remnants of which are still in place. If you look at the OS 1:25000 (Explorer) scale, you can see, in white, an old slip road leaving the motorway, curving under A1 and joining it at an angle, permitting only southbound continuation. There was a corresponding NB slip road, the stub of which is also visible on the map, leaving A1 to join the incomplete motorway. All motorway traffic had initially to use these slips, though later on the flyover from A1 Great North Way was opened. When the motorway was opened to Brent Cross, the slips were closed, the SB one being retained for emergency use, though how often it's been needed I don't know. It's barriered off at both ends, to the best of my knowledge.
It was in use for an extended period following IIRCthe Staples Corner bombing in 1992 - here's an old thread with some photos: viewtopic.php?f=1&t=33552
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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by Gav » Tue Nov 17, 2020 21:24

2.jpg
from old-maps

The M1 came down and then merged onto the existing road in an unusual way as shown.

in addition to this there was an alteration made to the flyover as a temporary measure to allow traffic to bypass and get onto the M1 earlier, and also this provided a flyover by using the other carriage way as a temporary route to take traffic over watford way from the Great North road. It was a wierd set up and existed for a few years until the M1 was extended south.
1sa.jpg
and a scan from a map
M1_J2_from_BP_1975_map_-_Coppermine_-_23.png

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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by Owain » Tue Nov 17, 2020 22:57

The end? Surely that's the beginning!

I clicked on this thinking it would be about Leeds... very interesting though.
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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by Bryn666 » Mon Dec 14, 2020 09:59

More detail towards the end of this thread.

viewtopic.php?f=1&t=12321
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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by Gav » Wed Jan 06, 2021 20:18

1970 M1 southern end....
M1.jpg

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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by Chris5156 » Wed Jan 06, 2021 21:09

Gav wrote:
Wed Jan 06, 2021 20:18
1970 M1 southern end....

M1.jpg
Also available on SABRE Maps!

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Gav
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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by Gav » Wed Jan 06, 2021 22:22

Chris5156 wrote:
Wed Jan 06, 2021 21:09
Gav wrote:
Wed Jan 06, 2021 20:18
1970 M1 southern end....

M1.jpg
Also available on SABRE Maps!
thats where I got it ! thank you

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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by baroudeur » Thu Jan 07, 2021 15:13

After it opened, living close to J12, I used the M1 regularly into London. From 1968 -1972 I commuted daily into Clapham, London and used all the variations of the M1/A1 junctions. Interesting days as I visited almost all of the London Borough workshops during the various changes took place to London traffic. However, keen as I am on driving, central London is now a no go for me whereas the Paris Peripherique still gives no qualms.

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Re: M1 motorway: the end (according to OS One Inch 7th Series mapping)

Post by the cheesecake man » Fri Jan 08, 2021 20:32

It's visited (from 1.29-2.01) in Geoff and Jay Go Up The A1 (Part 2) on You Tube

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