# TurnRestriction A turn restriction is a restriction based upon a vehicle manoeuvre. This type of restriction includes prohibitive driving instructions, mandatory driving instructions and implicit restrictions. Prohibited instructions are indicated by road signs within a red circle, examples include No U Turn, No Right Turn or No Left Turn. These can include exceptions to the instruction and are typically elements like Except for Buses. Mandatory driving instructions are indicated by road signs within a blue circle or painted on the roadway such as Turn Right, Ahead Only and No Left Turn. Implicit restrictions occur where a turn is not signed as prohibited but would not be a normal manoeuvre. For example, where a road splits around a traffic island or at complex junctions where additional geometry has been captured to reflect the traffic flow. These are not differentiated from actual signed restrictions. A Turn Restriction will reference back to the Roads product through Link References and Multiple Link References.
Context Diagram of Turnrestriction

Context diagram: TurnRestriction

## TurnRestriction attributes A restriction on vehicular manoeuvre. ### id Unique identifier, for TurnRestriction this is a TOID. * **Attribute name:** id * **Type:** CharacterString * **Size:** 20 * **Multiplicity:** \[1] ### identifier Uniform Resource Identifier. * **Attribute name:** identifier * **Type:** CharacterString * **Size:** 37 * **Multiplicity:** \[1] ### inspireId External object identifier of the spatial object. * **Attribute name:** inspireId * **Type:** Identifier * **Multiplicity:** \[0..1] ### beginLifespanVersion Date and time at which this version of the spatial object was inserted or changed in the spatial data set. Note: The time part is always set to zero. * **Attribute name:** beginLifespanVersion * **Type:** DateTime * **Multiplicity:** \[1] ### networkRef Spatial reference of the network-related property. * **Attribute name:** networkRef * **Type:** NetworkReference * **Multiplicity:** \[1..\*] ### validFrom The time when the transport property started to exist in the real world. Note: The time part is always set to zero. * **Attribute name:** validFrom * **Type:** DateTime * **Multiplicity:** \[1] ### restriction Type of turn constraint. * **Attribute name:** restriction * **Type:** [TurnRestrictionValue](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-fundamentals/os-mastermap-highways-network-code-lists/turnrestrictionvalue) * **Size:** 34 * **Multiplicity:** \[1] ### inclusion Types of vehicle or use that the restriction applies to. * **Attribute name:** inclusion * **Type:** [VehicleQualifier](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-routing-and-asset-management-information/os-mastermap-highways-network-routing-and-asset-management-information-technical-specification/data-types/vehiclequalifier) * **Multiplicity:** \[0..1] ### exemption Types of vehicle or use that are exempt from the turn restriction. * **Attribute name:** exemption * **Type:** [VehicleQualifier](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-routing-and-asset-management-information/os-mastermap-highways-network-routing-and-asset-management-information-technical-specification/data-types/vehiclequalifier) * **Multiplicity:** \[0..1] ### timeInterval Time period to which the restriction applies. * **Attribute name:** timeInterval * **Type:** [TemporalPropertyType](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-routing-and-asset-management-information/os-mastermap-highways-network-routing-and-asset-management-information-technical-specification/data-types/temporalpropertytype) * **Multiplicity:** \[0..1] ### reasonForChange The reason for a change made to a feature. * **Attribute name:** reasonForChange * **Type:** [ChangeValue](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-fundamentals/os-mastermap-highways-network-code-lists/changevalue) * **Size:** 32 * **Multiplicity:** \[1]