§ Mr. F. Noel-Baker
asked the Minister of Transport if he has now decided which smoke meter to use in measuring fumes emitted from diesel-engined motor vehicles; and when he proposes to introduce it.
§ Mr. Marples
No existing smoke meter has yet proved itself to be suitable for enforcement purposes. My Department is hoping to develop a standard test procedure involving the use of a smoke meter for roadside enforcement, but a considerable amount of experiment will be necessary.