# Road Link attribution

The [Road Link Feature Type](https://docs.os.uk/osngd/data-structure/transport/transport-network/road-link) can be found in the OS NGD Transport Network Collection of the OS NGD Transport Theme. This feature type represents line geometry for Great Britain’s road system and provides a routable network when used in conjunction with the [Road Node Feature Type](https://docs.os.uk/osngd/data-structure/transport/transport-network/road-node).

Attribution is provided against Road Links (data schema version 5.0 onward) to indicate the presence of bus lanes; you can use the data to see if there is bus lane infrastructure present along a road or path and quantify how much there is.

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Please note that bus lane infrastructure is often disconnected in the real world, which will impact the continuity of the Bus Lane Presence attribution.
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<figure><img src="https://170091638-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0pZjHxkAvY7Mn6TqFBMD%2Fuploads%2F5J28yzKXf9VEDGzQ7hLp%2FRoadLink-01%20(1).png?alt=media&#x26;token=3e690b8b-130a-4a8d-a103-ded8a721e75b" alt="Example image showing bus lane presence along a Road Link. Attribution information is shown for the Road Link in a pop up box. A background map has been included to provide context. "><figcaption><p>Example image showing bus lane presence along a Road Link. A background map has been included to provide context. </p></figcaption></figure>

## Key attribution

Key Bus Lane Presence attribution on the Road Link Feature Type includes:

* **Overall Presence and Percentage**​: Indicate the length (in metres) and the percentage of the Road Link that has a bus lane present on it. ([Presence Of Bus Lane Overall M](https://docs.os.uk/osngd/data-structure/transport/transport-network/road-link#presenceofbuslane_overall_m) and [Presence Of Bus Lane Overall Percentage](https://docs.os.uk/osngd/data-structure/transport/transport-network/road-link#presenceofbuslane_overallpercentage) attributes.)
* **In Direction Presence and Percentage**​: Indicate the length (in metres) and the percentage of the Road Link that has a bus lane present on it that can be traversed in the direction of digitisation of the Road Link. ([Presence Of Bus Lane In Direction M](https://docs.os.uk/osngd/data-structure/transport/transport-network/road-link#presenceofbuslane_indirection_m) and [Presence Of Bus Lane In Direction Percentage](https://docs.os.uk/osngd/data-structure/transport/transport-network/road-link#presenceofbuslane_indirectionpercentage).)
* **In Opposite Direction Presence and Percentage**​: Indicate the length (in metres) and the percentage of the Road Link that has a bus lane present on it that can be traversed against the direction of digitisation of the Road Link. ([Presence Of Bus Lane In Opposite Direction M](https://docs.os.uk/osngd/data-structure/transport/transport-network/road-link#presenceofbuslane_inoppositedirection_m) and [Presence Of Bus Lane In Opposite Direction Percentage](https://docs.os.uk/osngd/data-structure/transport/transport-network/road-link#presenceofbuslane_inoppositedirectionpercentage).)

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### Note about percentages

Please note that percentage values are given to the nearest whole percent (for example, 15% not 14.8%). In cases where only a very small length of Bus Lane is associated with a Road Link, the percentage value will be rounded to 0% if the length is less than 0.5% of the length of the Road Link; therefore, you may see a small number of instances where a length in metres is populated but the percentage is 0%.
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