SpecialDesignationTypeValue

The SpecialDesignation feature type has the property ‘designationType’, which has the type SpecialDesignationTypeValue. The following table identifies the codes used to populate this field and a description for each code.

SpecialDesignationTypeValue coverage varies between LHAs and the individual codes. While coverage for statutory designations is good overall, coverage for some other values may be sporadic and inconsistent.

Code List: SpecialDesignationTypeValue

Designation of highways that are subject to special controls when undertaking street or road works

Code	Description
Protected Street	Statutory designation which restricts the placement of apparatus by a street or road works undertaker.
Special Engineering Difficulty	Statutory designation relating to streets or parts of streets associated with structures, or streets of extraordinary construction.
Traffic Sensitive Street	Statutory designation that restricts street works to be undertaken during period of high traffic.
Lane Rental	Indication that Street is part of a Lane Rental scheme. Section 74A of NRSWA enables highway authorities, with the approval of the Secretary of State, to charge street works undertakers a daily charge for each day during which their works occupy the highway – commonly referred to as lane rental schemes. This code is not used in Scotland.
Event Information	Indication that this Street has an event planned. This code is not used in Scotland.
Drainage And Flood Risk	Optional designation that provides details of areas that are susceptible to drainage and flood risk. This code is not used in Scotland.
Emergency Services Routes	Optional designation that alerts the Works Promoter if there is a need to keep the emergency services informed of proposed works and progress. This code is not used in Scotland.
Environmentally Sensitive Areas	Optional designation that identifies information about the local environment. This includes environmentally sensitive areas, such as sites of specific scientific interest and ancient monuments, or specially cultivated areas containing shrubs, plants or bulbs which shall be reinstated using the same or similar species. In Scotland, these are designations not made by Roads Authorities which place restrictions on activities, for which permission subject to conditions may or may not be granted, which can be carried out within or adjacent to the designated area. Consequently, any streets which pass through such designated areas are covered by any restrictions imposed by the designation.
Hazardous Material	Indication of hazardous materials that could be exposed or disturbed when roads are excavated or planed, for example, coal tar. This code is not used in England and Wales.
HGV Approved Routes	Optional designation that allows Works Promoters to consider the impact on HGVs of restricted traffic flow or alerts the Works Promoter that wide vehicles are commonplace. This code is not used in Scotland.
Level Crossing Safety Zone	Optional designation created by a Railway Operator, Network Rail or a Roads Authority. It identifies an area around a level crossing where, if occupied to carry out works, there is a risk of traffic obstructing the crossing.
Local Considerations	Optional designation that should be used to inform the Works Promoter of any special schemes that may impact working, for example, noise levels. This code is not used in Scotland.
Parking Bays And Restrictions	Optional designation that provides details of streets with parking meters, residents parking bays and parking restrictions such as yellow lines, red routes, and other permanent parking restrictions. This code is not used in Scotland.
Pedestrian Crossings, Traffic Signals And Traffic Sensors	Optional designation that captures streets that have a pedestrian crossing, permanent traffic signals or traffic sensors. For Scotland, this code also includes Loop in Road Surface. Loops include traffic signal detectors, vehicle counting and ice detection cables that are generally close to the surface of the road.
Pipelines And Specialist Cables	Optional designation that is created by the Local Highway Authority on behalf of the private sector oil or gas pipeline owner. This designation should be treated as a reminder to consult further, not as an absolute indicator of the nature of the pipeline or cable. For Scotland, this code also includes Apparatus at Shallow Depth which details apparatus placed at a shallower than recommended depth.
Priority Lanes	Optional designation that allows the Local Highway Authority to identify the location of bus lanes, and Cycle Routes in the street. This code is not used in Scotland.
Proposed Special Engineering Difficulty	Optional designation used to identify new streets or assets of extraordinary construction. One typical use is to identify the location of a designation during any consultation period. On conclusion of the consultation period this feature will typically become a Special Engineering Difficulty (SED). This code is not used in Scotland.
Road Trees	These are trees that the Roads Authority are responsible for, which grow near or within the road boundary (including the verge, footway, etc.). This code is not used in England and Wales.
Service Strips	These are areas, usually found in housing developments, abutting shared use surfaces and should be of 2m width, where the services to the housing are located. This code is not used in England and Wales.
Special Event	Optional designation that provides early awareness of special events to Work Promoters to enable them to consider any actions that they may need to take to avoid any works taking place on the street during the time(s) of the Special Event. This code is not used in Scotland.
Speed Limits	Optional designation that provides information about the speed limit applicable for the street. Only speed limits (signed or as per the legal order) over 40mph are recorded as standard with some LHAs providing 30mph speed limits as well. This data is intended to be used for planning of traffic management and works safety measures. This code is not used in Scotland.
Strategic Route	Optional designation that is used by Local Highway Authorities to identify Strategic Routes, such as the Primary Route Network. Strategic Routes are identified by the Highways Agency, TfL in London and the South Wales Trunk Road Agent (SWTRA) and North & Mid Wales Trunk Road Agent (NMWTRA) in Wales. This code is not used in Scotland.
Street Lighting	Optional designation that helps Works Promoters to carry out works in the evenings and at nights by providing relevant information about Street lighting. It is particularly useful for when Part night lighting where a council has a policy of turning lights off during specific hours. This code is not used in Scotland.
Streets Subject To Early Notification Of Immediate Activities	Optional designation that enables street authorities to designate streets that are particularly vulnerable to traffic. Work Promoters are required to provide early warning of activities to the authority immediately after the activity has commenced. This code is not used in Scotland.
Structures	For England and Wales, this is an optional designation used by asset owners to identify the existence of a structure that has not been designated as an SED. In cases where this identifies a Bridge, Works Promoters should regard it as a reminder that under Section 88 they must consult the Bridge Authority prior to serving Notices. For Scotland, this includes over-bridges and under-bridges as well as other structures including retaining walls, gantries, pipelines and cellars.
Traffic Calming Features	Traffic Calming Features include islands, build-outs, cushions, raised tables etc. This code is not used in England and Wales.
Traffic Sensitive Side Road When Temp Traffic Control is Employed	A traffic sensitivity designation applied to the first 50m (or complete length, whichever is shorter) of an adjoining street that has a junction with that traffic sensitive street. This code is used where road works on the adjoining street could cause delays on the traffic sensitive route. This code is not used in England and Wales.
Transport Authority Critical Apparatus	Optional designation that provides details of transport authority apparatus critical to operations of that authority which if damaged or if interrupted could disrupt or temporarily stop services (for example, HV cables to a rail network). This code is not used in Scotland.
Unusual Traffic Layout	Optional designation that provides details of where the layout of existing traffic signs, road markings, studs or verge markers is not in accordance with the Traffic Signs Manual. This code is not used in Scotland.
Winter Maintenance Route	Optional designation that helps determine the relative importance a route is given by a Local Highway Authority for clearing and treatment during the winter months. This code is not used in Scotland.