5 Amendment of road traffic regulations
In the Road Vehicles (Construction and Use) Regulations 1986 in regulation 37 (audible warning instruments)—
(a) in paragraph (5) for sub-paragraph (k) substitute—

“(k) owned or operated by the Secretary of State for Defence and used—
(i) for the purpose of any activity—
(aa) which prevents or decreases the exposure of persons to radiation arising from a radiation accident or radiation emergency; or
(bb) in connection with an event which could lead to a radiation accident or radiation emergency; or
(ii) for special forces purposes;”

;
(b) for paragraph (9A) substitute—

“9A In this regulation—
“radiation accident” and “radiation emergency” have the same meaning as in the Radiation (Emergency Preparedness and Public Information) Regulations 2001;
“special forces” means those units of the home forces the maintenance of whose capabilities is the responsibility of the Director of Special Forces or which are for the time being subject to the operational command of that Director; and
“special forces purposes” means, in relation to the use of a vehicle, the use of a vehicle by the special forces in response, or for training or practice in responding, to a national security emergency.
S.I. 2001/2975, to which there are amendments not relevant to these Regulations.”

.
S.I. 1986/1078; relevant amending instruments are S.I. 2005/2560, 2009/3221.