#788

Best practice is to take out roundabouts and replace them with signalised junctions these days.

The Dutch lag a bit behind Denmark on this.

The best example in the UK is probably this, at the old Whipps Cross roundabout:

and this example from further down Lee Bridge Road

#789

Best practice is context/location-dependent. (Which is to say nothing against the TfL design guide docs - I use them, and the Welsh guidance, often.)

The scale of those two examples seems way up from the Chorlton junction (which I suspect is a smidge too small for a fully prioritised roundabout, but I’d have to check).

And also up from the prioritised roundabout within a scheme I’ve just finished the design for, and which goes out to tender very soon. It includes zebra/parallel ped/cycle crossings over the carriageway arms, mini-zebras over the cycleways, and even a couple of floating bus stops, with single lane approaches, etc. Lovely stuff.

Should be a first for Scotland, maybe even the UK if we can get cracking and beat the below one to completion (which is a similar size to ‘mine’, but taking an age to get done and which looks to be set in a bigger area than the Chorlton location). Fair to say I’m very excited about it.

#790

Just wish there was the budget/council-level desire for things like that in Greater Manchester…

#791

The Chorlton one looks about the same scale as the second example. That whole road (Lee Bridge Road), now has junctions similar to that all the way along, some bigger than others.

& @wikihock

It’s well worth taking the opportunity to make a visit. The council run tours for councillors, engineers and campaigners on a regular basis. There have been delegations from Manchester and Glasgow already.

#792

Back in work and have just had a quick look at this to see what sort of space is available for an Inscribed Circle Diameter, as a rough guide to what could (but not necessarily should) fit.

Chorlton is approx 25 m - too small for a Dutch layout. A Compact or Continental roundabout ought to fit, but I suspect the traffic volume (seems to be ~14k vehicles per day on Wilbraham Road) might be considered too high (although up to 20k can be ok). And they’re not really compatible with the lead-in cycle lanes that seem to be planned on the arms. So fair enough. Ped scramble it is.

Cambridge is approx 45 m; Mine is approx 45 m; Lea Bridge Road is minimum 40 m - all very conducive to a typically sized Dutch roundabout. Would be interesting to know a bit more about the design thinking at Lea Bridge Rd.

Whipps Cross is at least 100 m - off the charts in this context. More of a gyratory than a roundabout, that one.

This page…

…claims that, according to the Dutch Institute for Road Safety Research “[Dutch] roundabouts with about 15,000 to 20,000 motor vehicles per day are two times as safe as signalised intersections.”.

swov-intersection-safety.jpg768×472 104 KB

#793

cycling-thread-for-normal-people-who-think-cycling-is-just-yknow-alright-or-perhaps-an-inexpensive-means-of-getting-from-a-b

:laughing:

Sorry, sexybum.

#794

It’s fine. Graphs are good. I think?

#795

Whipps Cross roundabout was originally built and planned to motorway intersection standards as it was meant to be the location of the junction of the North Circular and one of the Ringways roads.

#796

great chat

takes me back to the halcyon concrete-discussion-with-guntrip days

3 Likes
#797

Is this bike chat warny? It’s like they’re talking a foreign language.

1 Like
#798

no idea. Thinking of starting an all-purpose aggregate chat thread. Interested?

1 Like
#799

Is this the point where I post the Jay Foreman video about this?

#800
Answer

No

#801

If a normal person was going to cycle to work, whats the upper distance/time that is possible without having to take a change of clothes/shower at work?

#802

6 miles I reckon

1 Like
#803

I’d say the key factor is terrain . hills = sweaty

You could get away with quite a long flat commute provided you take your time a bit and aren’t required to ride into a massive headwind

3 Likes
#804

Or a mainly downhill commute in is good, cos then you only sweat on the way home . I had one a bit like this once

#805

I don’t shower (we don’t have them in our office), but I do take a change of clothes and have a freshen up at work.

My commute is 7 miles, pretty flat, but it’d need to be about 2 miles for me not to get sweaty, even in winter.

1 Like
#806

My commute is 7 miles each way and I do not shower when I get there, but I do wear clean lycra every day and change into normal clothes when I arrive. In the “height” of summer I can get a bit sweaty, but I just sit on one of the air conditioning units waiting to cool before changing.

1 Like
#807

Normal People