10 New Ideas for Better Roads
Hari Kalla, a professional engineer at the Department of Transportation’s Federal Highway Administration, in Washington, D.C., reveals what the best roads have that the worst roads don’t.
Turning Lanes at Stop-Controlled Intersections
At major intersections, lanes reserved for right or left turns can dramatically reduce crashes — in some cases, by as much as 48 percent.
Paving a gradual 30-to-35 degree slope to a road’s edge helps prevent the notoriously dangerous rollovers and crashes that occur when a tire inadvertently strays over a steep edge.
Used to separate opposing traffic on divided highways, these concrete or metal barriers have a long track record of reducing cross-median collisions.
Longer Yellow Lights
Adding one second to yellow lights can reduce red-light violations by as much as 50 percent.