Dictionary

Displaying 25 definitions on 1 pages:
Displaying 26 definitions on 1 pages:
2 A B C D E F G H I J K L M N O P R S T U V W X Y Z

Dangerisation

In cycle campaigning circles, 'dangerisation' is the claim that discussing safety, danger and potential risks suppresses cycling levels, and even causes people to give up cycling altogether.

Definitive map

A 'definitive map' is a document that county councils or unitary authorities in England and Wales (excluding inner London boroughs) have to draw up and maintain, to show all the rights of way in their ar

Design Manual for Roads and Bridges

A large multi-volume manual that sets out how trunk roads in Britain should be designed. It is still used to inform (often inappropriately) how streets and roads in urban areas should be laid out.

Design Speed

'Design Speed' refers to the assumed speed of users of a particular route, and therefore determines the way that route should be designed, to accommodate that speed. 

Desirable Minimum value

A 'desirable minimum' value is a design paremeter used when there is no existing constraint on a proposed or existing cycle facility. 

For instance, a 'desirable minimum' width of a one-way cycleway is 2.5m.

Desire line

A desire line represents the shortest and most obvious path between A and B.

Detector

A piece of equipment that serves to provide information to traffic signal control systems about vehicles, people, or cycles approaching or waiting at junctions, and adjusts signal time accordingly.

Detector Loop

A detector loop, or induction loop, is an electro-magnetic loop built in a road surface that provides traffic data, or alerts a traffic signal system to the presence of a vehicle or bicycle.

DfT

The Department for Transport - the body responsible for transport of all types in the UK.

Directness

One of the five main demands used to measure the quality of cycling infrastructure (the others are safety, cohesion

Disability Discrimination Act 1995

An Act to make it unlawful to discriminate against disabled persons in connection with employment, the provision of goods, facilities and services or the disposal or management of premises; to make provision about the employment of disabled pe

Distributor road

A distributor road is a road that links up access roads and through roads.

DMRB

Abbreviation of Design Manual for Roads and Bridges.

Door Zone

The 'door zone' is an area next to parked vehicles where a door can suddenly open into the path of an unwitting bike user.

Drain

Road furniture that can have a significant impact on the quality of cycle provision. 

Driveway

An entrance to a property. Where a footway or a cycleway crosses a driveway, both should continue across it without interruption, with a smooth, level, continuous surface.

An example of a footway crossing a driveway -

Dual carriageway

A dual carriageway is composed of two separate carriageways, separated by some kind of physical barrier or divider.

Dual network

The dual network is a concept which provides two types of cycling infrastructure. The theory is that experienced and confident cyclists will use the roads, while those less experienced or confident will use off-road facilities.

Dual provision

Dual provision is a design approach which involves employing two different (parallel) types of cycling infrastructure.

Dutch Bicycle Master Plan

A 1999 document, produced by the Fietsberaad, that documents the history of cycling in the Netherlands from 1890 up until 1999. 

Dynamic envelope

'Dynamic envelope' refers to the typical space someone takes up while cycling. It will be larger than the static width because people will 'wobble' while travelling along. 

Dynamo

A dynamo is a small electrical generator which uses the motion of the wheels to generate electricity.