If it is marked as a 20mph Zone, the limit must be self-enforcing
through chicanes, speed bumps and similar. Repeaters are neither needed
nor permitted. If it is not a Zone, but simply a road with a 20mph
limit, repeaters are required.
https://www.rospa.com/road-safety/advice/drivers/speed/20mph-zones-and-limits/
In the UK, in contrast to the rest of Europe, a road sign is supposed to
be valid "until further notice". In most European countries there are
rules/conventions that the sign only applies until the next junction, at
which point the sign must be repeated if required. There is also a
subtle legal difference: in the UK it is the "Traffic Order" that
determines the rule, and the highway authority is supposed to place
signs to inform people. But if somebody steals the sign and you
unwittingly drive too fast or whatever, a prima facie offence has been
committed and you will have to claim the absence of a sign as mitigating
circumstances. In Europe the offence is committed by ignoring the sign,
so if there is no sign, then no offence has occurred.
On 2018-05-01 18:42, Tobias Zwick wrote:
> Does the "there are no repeater signs" rule only apply for the default
> 30 mph limit (and the 20 mph zones)? Or in other words, if there is an
> explicit different limit posted, let's say 40 mph, does it have to be
> repeated at each intersection and feed roads?
>
> Tobias
>
> On 01/05/2018 16:35, Philip Barnes wrote:
>
> On 1 May 2018 10:41:28 BST, Tobias Zwick <o...@westnordost.de> wrote:
>
> This is where I need your help. How should the dialog be changed (in
> GB)
> to not create any misunderstandings here?
> Difficult without having seen the speed limit signs as you have entered the
> zone.
>
> My usual approach is to survey the change points, split the ways at those
> points. Often the limit change is painted on the road so can be seen on
> imagery.
>
> 20 limits are likely to exist in the centre and close to schools, so those
> areas need survey to check. If in doubt leave the limit unmapped.
>
> The radial roads are the usual start point for mapping speed limits, these
> are where the transitions usually occur and are where the 40 zones are found.
> In cities it is rare to find a direct 30 to NSL change.
>
> If a road is has no speed limit sign it will inherit the speed limit from its
> feed road, which if that has been mapped makes it easy.
>
> In the case of short limits where a road passes through a small village you
> need to be able to split the way at the zone transitions otherwise you will
> end up tagging the entire way.
>
> Phil (trigpoint)
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