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5-4(2) ROAD DESIGN NL4NUAL (ENGLISH) JUNE, 2000 <br /> <br />54.01.04 Left-Turn Bypass Lanes <br /> I_f a lek-turn lane is sot warranted, or if [he construction of a lek-turn lane is not practical (due to ~'W, <br />terrain, etc.), leaving no left-mm treatment as the only other alternative, designers should consider left-turn bypass <br />lanes. <br /> <br /> The bypass lane shown in figure 5-4.01A is for use at"T" inter~ections. The combination right-turn and' <br />bypass lane shown in figure 54.01B is for use at four-legged intersections. Because of the higher volumes <br />associated with four-legged intersections, tek-mm lanes are a more appropriate solution, Bypass lanes at four- <br />legged intersections should only be used after all other solutions have been found ma_practical and where [he cross <br />street volume is [ow. <br /> <br /> Exclusive left turn lanes are the most effective and safe way to separate the left-turning from the through <br />traffic streams. Bypass lanes are a convenience or an emergency measure, and are designed for lower speed <br />maneuvering. If a left turn is warranted and practical, then it should be built. Bypass lanes are a quick and <br />inexpensive way to make intersections (that would otherwise have no left-turn treatment) more efficient for traffic <br />operation. <br /> <br /> Designers should take into account that pavement markings for bypass lanes will infnnge on the <br />availability of the passing zone. <br /> <br />5-4.01.0S CTWLTL <br /> A continuous Two-Way Left-Turn Lane on rural 2dane roadways may be considered on sections of <br />roadway with numerous entrances and a high accident rate. For design of CTWLTL and additional inlbrmation, see <br />Sect/on 5-3.01. <br /> <br />BY-PASS LAaNE at '~r" IiNTERSECTION' <br /> Figure 5-4.01A <br /> <br />-8- <br /> <br /> <br />