Triple left turn lanes and dual right-turn lanes are still considered as relatively new design alternatives that have been implemented in a very limited number of intersections in Texas. This project is intended to achieve two goals; (1)develop geometric design and installation guidelines for triple left-turn and dual right-turn lanes, and (2) evaluate the safety and operational performances of existing triple left-turn and dual right-turn lane sites in Texas. To this end, the research will (1)review existing design guidelines and practices regarding triple left-turn lanes and dual right-turn lanes around the country, (2)perform studies of existing triple left-turn and dual right-turn locations to document existing design issues and concerns, operational performance, and safety performance (3)identify the important factors that affect the design, operation and safety of triple left-turn and dual right-turns, (4) develop geometric design criteria for triple left-turn or dual right-turn lanes, (5) develop installation criteria for determining when triple left-turn or dual right-turn lanes should be installed, and (6) develop guidance on the signal design for installation of triple left-turn or dual right-turn lanes.