Max speed on a sliproad
Discussion
Joining a motorway, after the blue motorway sign it's 70 (for a car or bike), unless there are any other restrictions in place.
M53 Junction 6. It's a two way single carriageway road. Speed limit.............?
http://maps.google.co.uk/?ie=UTF8&ll=53.304967...
M53 Junction 6. It's a two way single carriageway road. Speed limit.............?
http://maps.google.co.uk/?ie=UTF8&ll=53.304967...
ukcerb said:
Just want to clarify that I am right. The speed limit on a sliproad joining a Motorway or NSL dual carriageway (or triple carriageway) is the same as the road it is joining ie 70mph.
Dual carriageway can have any number of lanes! Traffic travelling in opposite directions is separated by a barrier or other physical boundary like a hedge, rather than a while line.As such a triple carriageway doesn't really exist, unless you count a location where different roads run side by side.
As hinted at above, if no speed limit is posted, then the blue motorway sign means 70mph (just as the NSL means 60mph on an A, B or C road), and the blue sign is usually put at the beginning of a slip road, so therefore the 70mph limit includes the slip road. Equally, on the way off the motorway, the NSL or posted speed limit is again at the end of the slip road, meaning the slip road is a continuation of the m/way speed limit.
I expect a rumour may have started based on the fact that 70mph is often too fast to safely join or leave a motorway if a busy lane one is moving at around 56-60mph. Some people love to simplify things by stating speeds, and I can imagine an instructor stating "join at 60mph" may have been mis-understood.
I expect a rumour may have started based on the fact that 70mph is often too fast to safely join or leave a motorway if a busy lane one is moving at around 56-60mph. Some people love to simplify things by stating speeds, and I can imagine an instructor stating "join at 60mph" may have been mis-understood.
Dr Jekyll said:
flemke said:
It would be a very rare slip road that was not a DC. DCs are 70 unless posted otherwise.
.......And a motorway slip road that's SC is 70 anyway."Dual carriageway" refers to when there is a physical separation between lanes, not to the number of contiguous lanes.
The whole point of a sliproad is that its allows you to matchyour speed to that of the traffic on the road you are joining. It would therefore be pretty dumb to have a lower speed limit on the slip road.
Having said that the highways designers have decided to put traffic lights at the bottom of the slip road onto the M42 at J3. This is fine if traffic is heavy, but a few weeks ago the lights stopped me when traffic was light and I then had top join the motorway with cars travelling at 70 plus mph, but I had a 5mph rolling start and only about 200 yards of slip road left! Good job the A6 is swiftish
Having said that the highways designers have decided to put traffic lights at the bottom of the slip road onto the M42 at J3. This is fine if traffic is heavy, but a few weeks ago the lights stopped me when traffic was light and I then had top join the motorway with cars travelling at 70 plus mph, but I had a 5mph rolling start and only about 200 yards of slip road left! Good job the A6 is swiftish
highway code said:
259
Joining the motorway. When you join the motorway you will normally approach it from a road on the left (a slip road) or from an adjoining motorway. You should
give priority to traffic already on the motorway
check the traffic on the motorway and match your speed to fit safely into the traffic flow in the left-hand lane
not cross solid white lines that separate lanes or use the hard shoulder
stay on the slip road if it continues as an extra lane on the motorway
remain in the left-hand lane long enough to adjust to the speed of traffic before considering overtaking
so its 70.Joining the motorway. When you join the motorway you will normally approach it from a road on the left (a slip road) or from an adjoining motorway. You should
give priority to traffic already on the motorway
check the traffic on the motorway and match your speed to fit safely into the traffic flow in the left-hand lane
not cross solid white lines that separate lanes or use the hard shoulder
stay on the slip road if it continues as an extra lane on the motorway
remain in the left-hand lane long enough to adjust to the speed of traffic before considering overtaking
flemke said:
I think you mean, "a motorway slip road that is single lane..."
"Dual carriageway" refers to when there is a physical separation between lanes, not to the number of contiguous lanes.
No, I'm referring to the case of a true SC slip road. I think there used to be one on an M6 junction just North of Lancaster."Dual carriageway" refers to when there is a physical separation between lanes, not to the number of contiguous lanes.
Every time this topic comes up there is an entertaining debate about the concept of SC motorways so I was just trying to stir it up again.
Dr Jekyll said:
flemke said:
I think you mean, "a motorway slip road that is single lane..."
"Dual carriageway" refers to when there is a physical separation between lanes, not to the number of contiguous lanes.
No, I'm referring to the case of a true SC slip road. I think there used to be one on an M6 junction just North of Lancaster."Dual carriageway" refers to when there is a physical separation between lanes, not to the number of contiguous lanes.
Every time this topic comes up there is an entertaining debate about the concept of SC motorways so I was just trying to stir it up again.
Oh, wait - we're talking about Britain. I believe it.
flemke said:
You're saying that there is/was an actual, permanent motorway slip road with contraflow traffic, separated only by a bit of paint on the asphalt? I don't believe it.
Oh, wait - we're talking about Britain. I believe it.
Edinburgh City Bypass, Dreghorn JunctionOh, wait - we're talking about Britain. I believe it.
Nice unusual bit of road!
The Bypass has motorway restrictions (hard shoulder for loads of the way, no <50cc etc) but this two-way slip road.
(edit for the wrong quotation)
Edited by simoid on Tuesday 8th February 10:26
From the HC.
Joining the motorway. When you join the motorway you will normally approach it from a road on the left (a slip road) or from an adjoining motorway. You should
give priority to traffic already on the motorway
check the traffic on the motorway and match your speed to fit safely into the traffic flow in the left-hand lane
By definition, slip roads must be same speed limit as the carriageway you are joining!
Funny thing though, a very nice man in a white van I drove behind as we were joining the A90 dual carriageway at Portlethen thought it was 40
strange I thought.
Joining the motorway. When you join the motorway you will normally approach it from a road on the left (a slip road) or from an adjoining motorway. You should
give priority to traffic already on the motorway
check the traffic on the motorway and match your speed to fit safely into the traffic flow in the left-hand lane
By definition, slip roads must be same speed limit as the carriageway you are joining!
Funny thing though, a very nice man in a white van I drove behind as we were joining the A90 dual carriageway at Portlethen thought it was 40
strange I thought.Edited by Vipers on Tuesday 8th February 07:23
simoid said:
Edinburgh City Bypass, Dreghorn Junction
Nice interesting bit of road!
The Bypass has motorway restrictions (hard shoulder for loads of the way, no <50cc etc) but this two-way slip road.
Could you not argue that the "slip road" starts after the junction on the left, and where the "no pedestrians, no cyclists, no horse drawn vehicles" sign is?Nice interesting bit of road!
The Bypass has motorway restrictions (hard shoulder for loads of the way, no <50cc etc) but this two-way slip road.
There's something going on with the speed limits. Coming over the bridge from the petrol station it's a 30. Coming over the bridge the other way from the DC exit it's signed NSL.
Vaux said:
Could you not argue that the "slip road" starts after the junction on the left, and where the "no pedestrians, no cyclists, no horse drawn vehicles" sign is?
There's something going on with the speed limits. Coming over the bridge from the petrol station it's a 30. Coming over the bridge the other way from the DC exit it's signed NSL.
Yeah I suppose the slip road starts after the junction to the firing range, but most people treat the 'slip road' - or area for matching speed - as starting once you are off the bridge and round the corner. I don't get about much but I'm thinking it's quite unique - probably because the other road is older than the bypass.There's something going on with the speed limits. Coming over the bridge from the petrol station it's a 30. Coming over the bridge the other way from the DC exit it's signed NSL.
The bridge and the other slip road/road before slip road must be NSL, there are NSL signs at the end of both bypass off slips. The absence of one on the opposite side of the 30 - the road which heads into the urban streetlit area will cause uncertainty though.
Driving past there it has always confused me a bit in terms of speed limits. I thought for a while it must be 30 as there are no signs (perhaps to keep that junction on the 'slip' safe) but I now see the lack of streetlighting must mean that it's NSL 60
Should they have a NSL sign on the back of the 30 to make it clear?
simoid said:
Should they have a NSL sign on the back of the 30 to make it clear?
I would have thought so. I don't think you should have different speed limits on either side of an SC road, which is what that bit over the bridge is.I can see how it would be a surprise to turn onto that "slip road" and see something driving up at you!
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