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From page 1...
... xi EXECUTIVE SUMMARY Left-turn movements at intersections, including driveways -- especially movements that are made from lanes that are shared with through traffic -- cause delays and adversely impact safety. The objectives for this National Cooperative Highway Research Program (NCHRP)
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... xii width increases, although only by a small amount (less than 1 sec between the one-lane group and the two-lane or very-wide-one-lane group)

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