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In Bermuda, experience is showing that intelligent use of a noise meter, coupled with vigorous legislation, can reduce motorcycle noises to a very noticeable extent. The machines are run on rollers in a small reverberant test shed, sound level being measured by a General Radio 1551 A meter operated in the “flat” position, as preliminary tests showed that this procedure would rate the machines in close accordance to the ear and with the desired accuracy. After preliminary testing, a limit of 93 db as measured by this procedure was imposed on all new auxiliary cycles (small motorcycles) being sold, which resulted in the development of quieter models by several makers. Recently, the same limit has been extended to all the auxiliary cycles on the island, which must be tested and licensed by October 1. To date, more than 4000 noise tests have been run in connection with this program, and these are summarized in the paper. Experience has shown that testing is quick and convenient, with a high order of reproducibility and accuracy. Dealers and owners appear convinced that the tests are fair and accurate, and very noticeable progress is being made in noise abatement.

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