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1310.03(3) Right-Turn Lanes <br />Right-turn movements influence intersection capacity even though there is no conflict between <br />right-turning vehicles and opposing traffic. Right-turn lanes might be needed to maintain <br />efficient intersection operation. Use the following to determine when to consider right-turn <br />lanes at unsignalized intersections: <br />• For two-lane roadways and for multilane roadways with a posted speed of 45 mph or <br />above, when recommended by Exhibit 1310-11. <br />• A crash study indicates an overall crash reduction with a right-turn lane. <br />• The presence of pedestrians requires right-turning vehicles to stop. <br />• Restrictive geometrics require right-turning vehicles to slow greatly below the speed <br />of the through traffic. <br />• There is less than decision sight distance for traffic approaching the intersection. <br />• For unsignalized intersections, see 1310.03(4) for guidance on right-turn lane lengths. <br />For signalized intersections, use a traffic signal analysis to determine whether a right- <br />turn lane is needed and what the length is (see Chapter 1330). <br />• A capacity analysis may be used to determine whether right-turn lanes are needed to <br />maintain the desired level of service. <br />• Where adequate right of way exists, providing right-turn lanes is relatively <br />inexpensive and can provide increased operational efficiency. <br />• The right-turn pocket or the right-turn taper (see Exhibit 1310-12) may be used at <br />any minor intersection where a right-turn lane is not provided. These designs reduce <br />interference and delay to the through movement by offering an earlier exit to right- <br />turning vehicles. <br />• If the right-turn pocket is used, Exhibit 1310-12 shows taper lengths for various <br />posted speeds. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Index #5