Safe Speed Forums

Does the speed limit on a dual carriageway or motorway always have to be the same speed limit in both driections?

Nope. Part of the eastern end of the M4 is 50 eastbound (or is it 60 now?)and 70 westbound. It's just normally the same both ways I think.

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Make everything as simple as possible, but not simpler - Einstein

Its not unusual for urban motorways to have two different speed limits depending on direction, the M8 in Glasgow springs to mind.

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Fixed ideas are like cramp, for instance in the foot, yet the best remedy is to step on them.

Ian

If i remember correctly, part of the A556 between the M6 and the M56 also has different limits for each direction along part of it.

E/b it's 60 from J4 to near the end of the bus lane section, before the Piccadilly Line bridge at Boston Manor/Osterley, then 40 all the way to the end. W/b it's 40 until the Piccadilly line bridge, then 70 - giving rise to a short section with a 30mph differential between the limits...

There's a section of the A4174 Avon Ring Road (by Bromley Heath, IIRC) where it's 50 in one direction and NSLA in the other. Incidentally, the roundabout junction of the Ring Road with the B4465 near Emerson's Green has a 40 limit for the roundabout only with NSLA in all directions away from the junction. I have never seen any attempt to enforce this.

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Keep right on to the end of the road ...

Ah yes, you've had to tell me before I think when I hadn't used it for a while and didn't know it had changed. It was just the section west of the Piccadilly Line bridge I was thinking of, elevated section (plus a bit IIRC) is the same both ways, as is J4 and west. But in between it's 60 one way and 70 the other for what? Three miles or so? Still haven't used it since I got fed up and started going A30 instead, but from memory it seemed about that.

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Make everything as simple as possible, but not simpler - Einstein

Interesting - thank you.

Does this mean the 40mph speed limit for the roadworks on the Northbound Carriageway of the M1 at Jnct 21 (covered by SPECS) could be safely raised to 50mph if the workforce is only working on the Southbound Carriageway?

It's probably like that for the same reason it's 40mph all night when no work is being done on either carriageway.

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Make everything as simple as possible, but not simpler - Einstein

Closer to 5 according to the map, though it feels even further when you're driving it...

Similar to the 50mph limit on the elevated M4 near port talbot.

Westbound the limit is still an (enforced) 50mph long after you've left the 'danger' area.

ONe of the most blatent cash machines I've seen on my travels.

The A34 just north of M3 J9 Winchester has a 60mph limit northbound which then becomes national past the A33 turn off. In the other direction there is a 60mph limit for at least half a mile before the A33 merges into the A34, and then it becomes 50mph.