Double-decker

1) As in double-deck bus (ie with an upper deck carrying additional passengers) - common in the UK although rarely seen in Europe. Also double-deck trailers where an additional deck virtually doubles-up load capacity.

DoT register (of tachograph seals)

1) Tachograph installations must be mandatorily sealed following calibration/two-yearly checks with lead, customs-type seals. In fixing the seal a number and the approved fitting station code is impressed.

Dot-matrix (printer)

1) Type of printer used with computers which prints on the paper with series of ‘needles’ which form the letters by means of a dot matrix.

Dolly

1) Also towing dolly. Single-axle bogie (may be fitted with fifth-wheel coupling) used to support trailer/semi-trailer. Forms part of a composite trailer.

DOE

1) Department of the Environment - in Northern Ireland all road transport licensing and related matters are handled by the DOE in Belfast, not the DTLR as in Great Britain.

Document de suivi

1) Tracing note, signed by the consignor of a load, which must be carried by all carriers moving goods to, from or within France in addition to the standard CMR consignment note. It must be produced to the police on demand. Not required for through transit loads.