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M1 roadworks (Leeds and Chesterfield)

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So will we get 4 working lanes across the Tinsley viaduct?

 

 

 

.

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So will we get 4 working lanes across the Tinsley viaduct?

 

Per side or in total?

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So will we get 4 working lanes across the Tinsley viaduct?

 

 

 

.

 

Each way? Doubt the bridge is strong enough to take it...

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Each way? Doubt the bridge is strong enough to take it...

 

Last time the bridge was strengthened it was then immediately reduced to 2 lanes and has been ever since, I doubt they will stick more lanes in now.

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There'll be 3 running lanes and a hard shoulder on the viaduct when the schemes finished in both directions

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There'll be 3 running lanes and a hard shoulder on the viaduct when the schemes finished in both directions

 

Where's that from Jamie?

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There'll be 3 running lanes and a hard shoulder on the viaduct when the schemes finished in both directions

 

Didn't it have reinforcement works recently just to be able to continue to run 4 lanes in total.

It'll need rebuilding totally to run 6 or 8 won't it?

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Where's that from Jamie?

 

I've seen the lane layout drawings

 

Didn't it have reinforcement works recently just to be able to continue to run 4 lanes in total.

It'll need rebuilding totally to run 6 or 8 won't it?

 

No it's fine as it is to have 3 running lanes in each direction, it doesn't need any further strengthening work

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Didn't it have reinforcement works recently just to be able to continue to run 4 lanes in total.

It'll need rebuilding totally to run 6 or 8 won't it?

 

The works finished in c2005 made the viaduct structurally sound for three running lanes and a hard shoulder in each direction. Prior to reopening, discussions with the police resulted in an agreement to operate with a lane drop and lane gain at both ends resulting in current two running lanes in each direction over the viaduct. My understand is that principal of a lane gain, lane drop will remain, thus four lanes on approach (ALR*), lane drop to three running lanes and hard shoulder over the viaduct, then lane gain back to four lanes (ALR).

 

* ALR = All Lane Running

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So given that the capacity of a road is determined by it's narrowest point, it's a complete waste of time and money to expand the rest of the nearby M1 to have 4 running lanes, as all that traffic MUST fit into 3 lanes to cross the viaduct.

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So given that the capacity of a road is determined by it's narrowest point, it's a complete waste of time and money to expand the rest of the nearby M1 to have 4 running lanes, as all that traffic MUST fit into 3 lanes to cross the viaduct.

 

Wouldn't that only be an issue if all 4 approaching lanes were completely full? Otherwise you might as well say converting any of the M1 to 4 lanes is a waste...and converting any of the A1 to 3 lanes must be a waste as well...

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So given that the capacity of a road is determined by it's narrowest point, it's a complete waste of time and money to expand the rest of the nearby M1 to have 4 running lanes, as all that traffic MUST fit into 3 lanes to cross the viaduct.

 

Not quite, traffic over the viaduct is 70% of that to the south of Tinsley roundabout.

 

Actual figures from 2009 are

J35-34 = 114k AADT

viaduct = 80k AADT

J34-33 = 113k AADT

 

These have increased - not got access today to current but point made is that a lane drop from 4 to 3 lanes is appropriate here.

Edited by Haydn1971

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