The OS MasterMap Highways Network with Average Speed product identifies the average speed travelled across all roads in Great Britain at different times of day. The average speed is calculated based on detailed historical speed information, which is collected annually by in-vehicle telematics devices and mapped to each unique OS MasterMap RoadLink TOID. The average speed value is provided in both directions. The average speed is provided in km/h and for each road link.

The average speed product provides a detailed breakdown of the speed travelled at different times of day. The times of day available are as follows:

• 07:00 – 09:00 Monday – Friday (Peak AM)

• 10:00 – 16:00 Monday – Friday (Off Peak)

• 16:00 – 19:00 Monday – Friday (Peak PM)

• 19:00 – 23:00 every day (Evening)

• 00:00 – 04:00 every day (Night-time)

• Weekend

The context diagram below shows the feature attribution of Average Speed data and the relationship to the OS MasterMap Highways Network RoadLink feature. This is a one-to-one relationship and is realised through the “RoadLinkId” attribute in the Average Speed file.

The OS MasterMap Highways Network with Average Speed product contains detailed average speed information which is calculated using over 135 000 vehicles with inbuilt trackers and GPS loggers and mixed-use vehicle fleet telematic data. The main type of vehicle is cars, but LGVs and HGVs are also used

to calculate the average speed. The data is polled every 1 to 10 seconds and then attached to the Ordnance Survey road network.

The data is then analysed and checked against current and previous polls to ensure the data is captured against the correct OS MasterMap Road Link feature. The average speed data is provided with bi-directionality, meaning two speed values are provided on single-carriageway roads. These speeds are named in the product data as an “A” speed and a “B” speed in km/h. The speed will be given on the road link for the direction of travel. The A side represents the direction from node A to B and is in the direction of digitisation of the road link while the B side is from node B to A and is against the direction of digitisation.

When a link is one-way the speed will always be provided only in the A column attributes.

Within any given month of data collection, there will be 99% coverage of average speed information for Motorways, A Roads and B roads and over 50% coverage of C class roads. For road links or time periods where there is no speed data available over the 12 months, these road links are infilled using neighbouring link information to ensure 100% coverage of data. This data is released annually and built against one version of the Ordnance Survey network; therefore, the complete link matching is for this version only.

The average speed information is provided in both directions of a road link, named A and B in the attributes. The Direction attribute informs you if the speed information applies to both directions of a road link or if it applies to one-way road links. When the speed is provided only within an “A” attribute means the speed applies to one-way road links and the direction values indicates if the speed applies in the direction or against the direction of digitisation. The table below describes the codes which will be used to populate this field and the description for each code.

Code List: ChangeValue

Average Speed data is supplied as a Comma-Separated Values (CSV) file with headers included and will appear in the following format:

A code list or enumeration is a controlled set of values which can be used to populate a specific column.

Average Speed attributes

Historical Average Speed on a highway.

RoadLinkId

Unique identifier, for OS MasterMap Road Link feature, this is a TOID.

• Type: nvarchar

• Size: 50

• Multiplicity: [1]

Code

The Road Feature code (e.g. 3000 Motorway).

• Type: Integer

• Multiplicity: [1]

Length

The OS RoadLink length in metres.

• Type: Float

• Multiplicity: [1]

This section describes the features which make up OS MasterMap Highways Network with average speed. The attributes associated with these feature types are listed below along with a brief description of their data properties.

The direction to which the average speed applies to. If this is populated with 0 the average speed applies to both directions (A and B) of a road link and if it is 1 (A>B direction, in direction of digitisation) or -1 (B>A Direction, against direction of digitisation) the average speed applies to one-way road links. When the road link is one-way the speed will always be provided in the A column attributes and the Direction value 1 or -1 will show if the average speed applies in or against direction of digitisation of the road link.

DirectionValue attributes

• Multiplicity: [1]

PeakAM0709MonFriA

This is the average speed for Monday – Friday for 07:00 until 09:00 and is in direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [1]

PeakAM0709MonFriB

This is the average speed for Monday – Friday for 07:00 until 09:00 and is against direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [0..1]

PeakPM1619MonFriA

This is the average speed for Monday – Friday for 16:00 until 19:00 and is in direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [1]

PeakPM1619MonFriB

This is the average speed for Monday – Friday for 16:00 until 19:00 and is against direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [0..1]

OffPeak1016MonFriA

This is the average speed for Monday – Friday for 10:00 until 16:00 and is in direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [1]

OffPeak1016MonFriB

This is the average speed for Monday – Friday for 10:00 until 16:00 and is against direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [0..1]

EveningSpeed1923EveryDayA

This is the average speed for Monday – Sunday for 19:00 until 23:00 and is in direction of digitisation of the road link.

• Type: Decimal

• Size: 120

• Multiplicity: [1]

EveningSpeed1923EveryDayB

This is the average speed for Monday – Sunday for 19:00 until 23:00 and is against direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [0..1]

NightTime0004EveryDayA

This is the average speed for Monday – Sunday for 00:00 until 04:00 and is in direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [1]

NightTime0004EveryDayB

This is the average speed for Monday – Sunday for 00:00 until 04:00 and is against direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [0..1]

Weekend0719A

This is the average speed for Saturday – Sunday for 07:00 until 19:00 and is in direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [1]

Weekend0719B

This is the average speed for Monday – Sunday for 07:00 until 19:00 and is against direction of digitisation of the road link.

• Type: Decimal

• Size: (10, 2)

• Multiplicity: [0..1]