In the UK parking enforcement is normally by lines and indications displayed in streets.
Why do I highlight lines and signs? It's due to the fact that you can not have indications which impose a parking constraint without lines suggesting which part of the street the parking constraints impact. This may perhaps appear simplified but if you think of let us say a no waiting sign the sign will specify the times or days or sometimes month of the year - however how do motorists determine to what span of the roadway the restriction applies?
A single yellow line indicates that there is a parking limitation however that is not developed for 24/7. As a result so as to comprehend exactly what the actual constraint exists need to be indications indicating the times and days that the prohibition uses. These signs, commonly referred to as repeater indications, must be sited every 60 metres along the length of the pavement (sidewalk in the USA) for the degree of the single yellow line constraint to which it applies. As you can value there are locations where a single continuous yellow line would go for a significant range so there is a legal dispensation under which those signs are not required.
This concession permits a regional authority not to have repeater indications if there are signs, called Controlled Parking Zone indications, at the access to each street getting in the zone where single yellow lines are painted. Such regulated parking zone signs must particularly specify the limitation that uses to all single yellow lines in the zone.
Likewise the restrictions on loading need to be accompanied by a sign and in this case kerb markings. These kerb markings are occasionally known as chevrons otherwise "blips". A single yellow kerb mark indicates that there is a packing restriction but it does not in alone designate the days and times of that constraint just that it will not use 24/7. For that reason it needs to be accompanied by a sign providing the details connecting to the limitation.
Double kerb marks kerb marks define that there is no loading 24/7 and despite the reality that this is an overall prohibition a sign showing that restriction is mandatory to be placed next to the kerb marking.
A double yellow line in a street shows that there is an overall 24/7 prohibition on parking (technically it's waiting rather than parking however everyone understands and uses the word parking). In this instance there is no requirement to have an indication revealing that there is a 24/7 restriction.
So to sum up for all with the exception of double yellow lines there need to be signs so the law is in these situations is: indication however no lines your parking ticket is not enforceable - lines however no signs your parking ticket is ticket can not automatic parking barriers be implemented.
Along with yellow lines parking bays have prohibitions - they are either solely meant for residents to park or for the public at large or even in some cases a multi-purpose bay which can be used by both locals and any motorist Similarly there are parking bays which are limited to particular motorists - e.g. for disabled motorists or are limited for particular functions - for example packing just.
The universal function of all these bays is that they must have a sign to show the sort of limitation e.g. is it for residents, handicapped vehicle drivers or loading only. In addition such indications are needed to suggest the times and days that their usage is restricted. Once again the law is if there are lines defining the parking bay then there has to be an indication revealing the nature of the prohibitions. For that reason if there is no indication any parking ticket drivers collect can not be implemented and you need to appeal.