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7 (a) (b) (c) (d) FIGURE 1 Examples of common LRT alignments through signalized intersections: median-running (a), side-running within roadway right-of-way (b), side-running adjacent to roadway (c), and mixed-use (d ). mon, however, for lanes to be designated as "LRV Only" lanes, turning movements across the LRT altogether. Challenges in with vehicular traffic running parallel to the LRT right-of-way. mixed-use alignments are similar to those without LRT oper- The LRV-only lane is differentiated from the roadway by sign- ations: motorist attempts to overtake and turn left in front age and striping, contrasting colored pavement, mountable of LRVs, motor vehicle traffic from the opposite direction curb, rumble strips, traffic buttons, or other tactical treatment. turning suddenly in front of an approaching LRV, and cross Motor vehicle turning movements for parallel running traffic traffic violating the red traffic signal. may be from the same lane in which the LRV is operating or from the adjacent lane to the LRT. In either case, only when PROBLEMS BETWEEN LIGHT RAIL VEHICLES it is clear and LRV operators are assured that there are no AND MOTOR VEHICLES AT SIGNALIZED conflicting moves, are they required to proceed through the INTERSECTIONS intersection with caution. Conflicting turning movements may be controlled by displaying red traffic signals for all directions The 1996 review of 10 LRT systems for TCRP Report 17 iden- of motor vehicle traffic when an LRV is passing through the tified the principal problems between LRVs and motor vehicles intersection, by permitting the conflicting move only after the at signalized intersections. These problems covered a range of LRV has passed through the intersection, or by prohibiting issues, including LRT alignment and complex intersection