Dual braking system

1) On motor vehicles whereby if one system (or one part of a system) fails a second (dual part) operates to provide braking power on at least half the wheels.

DTp

1) Department of Transport. Former name for what became part of the Department of the Environment, Transport and the Regions and now, since June 2001, the DTLR.

DTLR

1) Department of Transport, Local Government and the Regions. Successor to the DETR following the 2001 general election and government reshuffle. Undertakes all of the transport-related functions of its predecessor.

DSS

1) Department of Social Security. Government department concerned with the collection of national insurance contributions from employers and self-employed persons and payment of relevant benefits to claimants.

DSA

1) Driving Standards Agency. Government agency dealing with driving standards and conducting practical and theoretical driving tests.

DRS

1) Direct Rail Services. Rail freight operator principally engaged in moving nuclear materials for British Nuclear Fuel Limited (BNFL).