Abstract
Having once been rear-ended by a driver who continued his cellular-telephone conversation even as he emerged from the offending vehicle, I read the recent report by Redelmeier and Tibshirani (Feb. 13 issue)1 with great interest. Although sympathetic with their findings, I am not yet ready to concede the need for corrective laws. The pertinent question on which any rational legislation must be based is whether it is the manual or mental aspect of driving while using the telephone that causes the increased incidence of collisions.

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