How about making contact with the road experts at SABRE to answer some of these questions? I'm sure they'd have a pretty definitive view
Regards Brian On 30 September 2012 22:43, Peter Miller <[email protected]> wrote: > > > On 27 September 2012 17:42, Jason Cunningham <[email protected]>wrote: > >> As I mentioned earlier on it was speed limits for roundabouts along a >> dual carriageway that led to me doing a bit of research on UK speed limit >> legislation. >> My 'notes' are below >> http://wiki.openstreetmap.org/wiki/User:Jamicu/UK_Speed_Limits >> >> A roundabout does not meet the given definition of a dual carriageway >> provided by legislation, and therefore is classified as a single >> carriageway road. Therefore a NSL roundabout can either be a NSL Restricted >> road or NSL single carriageway road speed limit. Recently spotted that my >> satnav already new this. >> > > That does make sense. > > Slip road connected to dual carriageways also does not meet the definition >> of a dual carriageway. Slip roads on motorways are not covered by NSL >> legislation. The whole motorway network, which includes the slip roads, is >> deliberately outside NSL legislation. Motorways are "special roads" with >> separate legislation. If the slips roads are part of the Motorway Network >> then they're "special roads" covered the Motorway Legislation with a >> maxspeed for cars of 70 mph. >> > > Thanks for the clarification. So what about slip roads on non-motorway > dual-carriageways? Are these 70mph or 60mph in your view? > > Things can be different in Scotland. I concentrated on reading 'English' >> legislation and case law. Having read legislation and case law I'm happy to >> argue that British speed limit law is a mess. >> >> Once you understand the foibles of the legislation you'll start spotting >> stretches of road where signs are wrong or missing. The link below shows >> locations of street lighting around a junction. >> http://goo.gl/maps/I8uhr (yellow for lighting for main road, and orange >> for lighting of runabout which is technically a separate section of road.) >> There are clearly sections of road with 3 more street lamps that mean >> that unless otherwise signed the stretches of road are 'NSL Restricted' >> with speed limits for cars of 30mph. Roads leading up to the lighting are >> NSL single carriageway with speed limits cars of 60 mph. Legislation states >> there should be signs clearly advising you that NSL Restricted begins or >> small signs reminding you NSL single lane carries on, but they are missing >> (I haven't spotted nsl signs while driving or when double checking today >> using StreetView). Therefore the speed limit defaults to NSL Restricted. >> Since drivers would expect a sign for a change in speed limit they are >> unlikely to slow down to the NSL Restricted speed limit. Lack of signs for >> any other change in speed limit would mean it would be impossible to >> prosecute, but signs are not needed for NSL Restricted road and there is >> case law to support this. A problem for drivers, and for people trying to >> map speed limits. >> > > I believe that when one starts finding errors on the ground it is a good > indicator that you are getting good at what you are doing! > > Putting aside my little rant about missing speed limit signs, I think we >> could do with proper page giving some advice of speed limits if we intend >> to map them. >> > > Or just roll the details into the speed limits or maxspeed articles for > now as the same sort of questions are likely to appear in other countries? > > > Thanks, > > > > Peter > > > >> Jason >> >> >> >> >> >> >> >> _______________________________________________ >> Talk-GB mailing list >> [email protected] >> http://lists.openstreetmap.org/listinfo/talk-gb >> >> > > _______________________________________________ > Talk-GB mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-gb > >
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