Transport: FmLcPmShK

To the average pedestrian poised impatient on the curb it may seem a simple matter to determine whether an intersection should have a traffic light. Actually, however, that is a decision of almost Ein- steinian difficulty according to Assistant Engineer John T. Gibala of the New York City police, who last week explained in Spring 3100 (New York police monthly) the formula he has devised to solve the problem. If 3,000 intersections need traffic lights, but there is money for only 150 his is a sure-fire way of learning which crossings need lights most....

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