22. Mr. E. L. MaIlalieu
asked the Minister of Transport if he will make a statement on the tests carried out of methods of measuring the noise of motor cycles; and what measurement it is proposed to adopt.
§ Mr. Marples
Officers of my Department, with the full co-operation of the Motor Industry Research Association, the National Physical Laboratory and the manufacturers of motor cycles, have been engaged on tests on the lines of the draft International Standards Organisation proposals for methods of measuring noise emitted by vehicles. A meter indicating the sound level in decibels is being used. As the tests are still proceeding, I cannot yet say what sound levels will be regarded as permissible for different classes of vehicles.