Rights and Restrictions

The Rights and Restrictions sub-theme includes properties that prohibit, restrict or regulate the use of the network by traffic. Rights and Restrictions are typically defined through legislation, including the Traffic Regulation Order (TRO) made under the Road Traffic Regulation Act 1984.

The following types of rights and restrictions are in the scope of the current product:

• Access Restrictions

• Turn Restrictions

• Restrictions For Vehicles (Height, Weight, Width and Length restrictions)

• Highways Dedications (indications of Rights of Way)

Simplification and priority of Rights and Restrictions

Rights and Restrictions features record the effect and nature of the real-world restriction or environmental factors. However, this is not always possible as restrictions may manifest in many different ways yet have the same effect.

For example, a single restriction may consist of a one-way street that has a no entry sign, no right/left turn sign and/or mandatory turn signs on the approach roads. This is represented in the simplest way by recording a one-way street. To ensure a level of consistency, a hierarchy is used when more than one restriction that has the same effect occurs at a given location. Only the restriction that has the highest priority will be captured.

Restriction priority table

Priority	Restriction
1	One Way
2	No Entry/Access Prohibited To/Access Limited To
3	Mandatory Turns
4	No Turn

Therefore, Rights and Restrictions primarily model the effect of any restriction in the simplest possible way and secondary to this is recording the real-world manifestation.