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Traffic lights on roundabouts


Need4Speed

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Can anybody explain the point of building a roundabout then putting traffic lights on it?:(

 

i.) Pedestrian Access

ii.) Traffic management - if one road is main, then the other branches would have a hard time getting onto the roundabout, causing bigger tailbacks and more congestion.

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They've put in traffic lights on a large very busy roundabout near me.... thought WTF when they put them in but they really have worked, before, during rush-hour it'd take 20 minutes or so to go a mile down the bypass towards the roundabout, now it's more like 5 or 10. Can't argue with that :)

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Some roundabouts are so busy that traffic trying to join from a minor road would have to wait forever for a gap in the traffic flow

 

Isnt it right of way on a roundabout not major roads have priority ! Equally hard for any lanes to get on it ! Then again our area has only population of 30k, so these lights are really surplus !

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Isnt it right of way on a roundabout not major roads have priority ! Equally hard for any lanes to get on it !

 

Yup, but if there's 100,000,000,000 cars coming from a major road to the right of you you're screwed without traffic lights :) With them you may have to wait a couple of minutes for them to change, but when they do you're guaranteed to get out ;)

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Yup, but if there's 100,000,000,000 cars coming from a major road to the right of you you're screwed without traffic lights :) With them you may have to wait a couple of minutes for them to change, but when they do you're guaranteed to get out ;)

 

Ah ye I can understand it with large traffic congestion. Just pointless here tho tbh !

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they put traffic lights a few years ago to sort of traffic congestion on one of the busiest roundabout its east of scotland called Sheriffs hall roundabout,

 

and the tail backs it cause's is bad, and when the traffic lights are broken the roundabout is almost clear, its more a hazzard as you get people jumping the lights and causing blocks as another lane cant move, i must admit that i would be a fan of more traffic light camera's as its a dangerous thing to do, how many times have you been in a box junction and not much time to turn and some full jumps the lights and you have cars coming towards you

 

but i like the idea you get in some euro contries i think it is that there is a timer on the lights that shows you when they are going to change so no excuse for getting caught

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Fair enough, but personal experience shows that in some instances they are necessary during very busy times when relying on the traffic flow simply doesn't work. A prime example is the Army & Navy roundabout in Chelmsford - A lot of people come into the town centre via the roundabout, if the lights weren't there to control the flow of traffic then it would queue all the way across it, blocking everyone trying to come in the other direction.

 

All IMO of course ;)

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How about a roundabout with pedestrian crossing on all 4 exits ! 3 of em in town ! :blink:

 

I can't stand this.... so you come off of the roundabout checking your mirrors to ensure you're not going to hit anyone and come bonnet to face with a pedestrian. :rolleyes: There's one like this in Chelmsford, right off the roundabout but just before another junction coming out of the car park... so if you're leaving you check over your right shoulder at the roundabout to make sure it's clear (it's a damn risky junction at the best of times) and somehow also need to spot if someone to your left has decided to leap out into the road - not easy when there're loads of pedestrians about.

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Some roundabouts are so busy that traffic trying to join from a minor road would have to wait forever for a gap in the traffic flow

 

Not a roundabout but, same type of thing...cars going at ~40-50mph on a 30mph and due to the volume, you can't get out so, every couple of weeks, I hear then see this:

 

(Only yesterday & the Ford cars are just driving around it)

 

People have to push their way out FAST or you sit for 5-10mins.

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Lol ive seen one of them double roundabouts, madness !

 

You should take a trip to Swindon mate. there is a place there the size of a couple of footbal fields with six or seven mini roundabouts all inter-connected to each other.... I couldn't believe my eyes...:)

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Ahh the good ole Magic roundabout, lots of mini roundabouts circling a central mini roundabout, which you actually go around the wrong way !!!!!

 

As for roundabouts, they can only cope up to a certain traffic flow after which traffic lights work better, hence peak traffic lights on a roundabout are the best of both worlds.

 

if your traffic lights are on constantly then your flow has exceeded the optimum and it has effectively been replaced with traffic lights, but without the cost of junction alterations.

 

Mike

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