The pages in this section contain information and tips about the OS Multi-modal Routing Network (OS MRN) data and specific advice on how to make the most of the data provided by individual feature types.

The OS Multi-modal Routing Network (OS MRN) premium product contains three feature types: Transport Link, Transport Node and Turn Restriction

The pages in this section contain additional details about of the attribution for each feature type in the OS MRN and should be read in conjunction with the corresponding feature type page in the technical specification.

A Transport Link is a linear spatial object that defines the geometry and connectivity of a road, path, rail, or ferry network between two points in the network. Transport Links are split for connectivity purposes (for example, at junctions) and Transport Nodes connect the Transport Links together. Each Transport Link provides a reference to the Transport Nodes at the start and end of the Transport Link.

Transport Links contain information about the type of link (for example, highway='motorway') and information about the access restrictions for vehicles to indicate which modes can travel along the link (e.g motor_vehicle=’yes’). There is also a maximum speed attribute, and two average speed attributes:

• a conditional delimited list of all the speeds at different time periods

• a single average speed using the Mon-Fri 12-2pm period.

Transport Links also incorporate Modal Change links which are a linear spatial object representing a logical connection between the transport network and a transport site. See the Modal Change page for more information.

The Transport Link is attributed with a unique (but not persistent) WayID, which routing software uses to build out the network. Transport Links are also attributed with the OSID of the corresponding OS parent feature that is published in the OS NGD Transport Theme.

A Turn Restriction provides line geometry that indicates turn restrictions for the given Transport Link (for example No right turn or No U turn).

Where the Turn Restriction applies to specific vehicle type (for example, bus or HGV), this is identified by the corresponding separate attribute as described below, along with conditional values for when the turn restriction only exists on specific times or days.

The Turn Restriction is attributed with the OSID of the corresponding OS parent feature that is published in the OS NGD Transport RAMI Collection.

Turn Restrictions are named following a from-to-via pattern, where:

• from is the wayid of the first Transport Link involved in the turn restriction.

• to is the wayid of the last Transport Link involved in the turn restriction.

• via is the nodeid of the Transport Node at the junction (when there are only two links involved in the turn restriction), or a wayid list of all the Transport Links which are not the from or to link (when there are more than two links involved in the turn restriction).

OS Multi-modal Routing Network (OS MRN) contains Modal Change points to represent where you can transition between different transport modes. The OS MRN takes keys sites such as train stations, ferry terminals and car parks, and creates modal change points at these locations to enable connectivity.

Within the Transport Node feature type there are Modal Change nodes which are derived from transport sites. A node is created and sits within the primary building of the site. It is attributed with the os_nodetype of ‘Modal Change’.

Within the Transport Link feature type there are Modal Change links which are a linear spatial object representing a logical connection between the transport network and the transport site. These Transport Links connect between the network and the Modal Change node.

Modal change connectivity is only provided between sites and the road, rail and ferry network. Modal change points do not connect to the Path network as we do not currently capture access points from paths to sites in OS data.

Where Transport Nodes have been split apart due to grade separation, the original node keeps the existing OSID and the additional nodes are indicated with the suffix --1 or --2, depending on the grade separation value. Also, the geometries of grade separated Transport Nodes are offset (5cm in both the X and Y axes) to prevent routing software failure due to point spatial objects being at the same position.

If a Transport Link has a different grade separation at the start and end node, the link is split. The OSID of the new Transport Node between the split links is indicated with a suffix of --S. One of the Transport Links keeps to original OSID and the other has the suffix of --S.

A Transport Node is a point spatial object that is used to break up the Transport Network for connectivity. The Transport Network splits at the following locations:

• Where an attribute changes.

• The intersection or crossing of Transport Links.

• The start / end of a Transport Link.

Transport nodes build up the topology of the network and connect Transport Links together. They also represent Modal Change points where you can change travel modes. See the Modal Change page for more information.

Transport Nodes are also present at every vertex along the network. These ‘vertex nodes’ don’t split the network; they are provided to enable software that reads in OpenStreetMap (OSM) data to build up the network vertex by vertex. The vertex nodes allow customers to convert from GeoPackage format to OSM.

The Transport Node will be attributed with a unique (but not persistent) Node ID and also the OSID of the corresponding OS parent feature that is published in the OS NGD Transport Network Collection.

OS Multi-modal Routing Network (OS MRN) is designed and built in the OpenSteetMap (OSM) schema to facilitate straightforward import into many routing software applications. The OpenStreetMap model has three core data elements: ways, nodes and relations. See Elements - OpenStreetMap Wiki for more information.

• A way represents a linear feature on the ground. In OS MRN, these are called Transport Links and are linear representations of where people can travel along a network.

• A node is a single point in space. In OS MRN, these are called Transport Nodes and build up the topology of the network, connecting ways together.

• A relation defines how other elements work together. In OS MRN, these are called Turn Restrictions and represent information about turn restrictions.

OSM uses a system of tags to apply information against different features. We have taken existing OS network and routing data and mapped this to the OSM schema. We will include all the values from the OSM schema in the OS MRN code lists, but not all values are populated in the first release of OS MRN.

Transport Links combine the following existing transport information into one feature type:

• OS NGD Road Links

• OS NGD Path and Connecting Links

• OS NGD Ferry Links

• OS NGD Railway Links

• OS NGD Access Restrictions

• OS NGD Speed data

Transport Nodes combine the following existing transport information and into one feature type:

• OS NGD Road Nodes

• OS NGD Path and Connecting Nodes

• OS NGD Ferry Nodes

• OS NGD Railway Nodes

Turn Restrictions take the existing OS NGD Turn Restrictions.