Nowadays, motorcycle is the most popular mode of transportation in Indonesia. At the end of 2011, the population of motorcycles reached 67.83 million units and increased the composition of motorcycle on the road approximately from 60 to 70%. The huge number of motorcycles showed the changing of traffic flow characteristics and decreased signalized intersection performance. Motorcycles movement at intersection approach is usually caused traffic conflict between motorcycle and other types vehicles. The traffic conflict is potential to cause the accident. Therefore, red box for motorcycle at signalized intersection is designate a space for motorcyclists to wait at a red light. Motorcyclists stop in front of other types vehicles and can proceed through the intersection first when the light turns green. This is one of the solution to reduce conflict between motorcycle and other types vehicles and increase intersection performance.

Aim of this paper to analyze the influence of red motorcycle box to the traffic conflict and traffic flow at intersection. The traffic flow analysis method used MKJI (Indonesia road capacity manual) while the traffic conflict analysis used Bagulay C.J. method.

One of red motorcycle box was implemented at Ahmad Yani-Laswi intersection in Bandung in year 2010. Data collection from before to after implementation of red motorcycle box has surveyed at this intersection in order to determine the influence of red motorcycle box. The data which was collected are traffic volume and traffic conflict. Analysis result show that traffic flow rose up to 13% and the traffic conflict which involved motorcycle at intersection felt up to 39%. All in all, the traffic conflict has decreased and the traffic flow has increased at Ahmad Yani-Laswi intersection due to red motorcycle box implementation.