PERFORMANCE OF TRAFFIC CHARACTERISTICS DUE TO BOTTLENECK ON THE MAROS RIVER BRIDGE
One of the roads in Maros City that often experiences congestion is the narrowing of the road on the Maros River Bridge. For this reason, the purpose of this study is to examine these problems and find out the queues that occur at the Maros River Bridge. Primary data retrieval was carried out for 12 hours with a data collection period of fifteen minutes starting from 06.00 am to 06.00 pm. In the regression analysis, it is known that on normal roads and bottlenecks conditions, the Greenberg method has a better coefficient of determination than the Greenshield and Underwood methods. For the relationship between speed and density, the coefficient of determination (R2) is 0.725 and 0.806 for the Greenshield and Underwood methods and 0.817 for the Greenberd method. Meanwhile, in the relationship between volume and density, the coefficients of determination are 0.738, 0.796 and 0.731 for the Greenshield, Greenberd and Underwood methods. However, in the relationship between volume and velocity, a less significant relationship is obtained for these three methods, it can be seen because the coefficient of determination is only 0.394 and 0.391 and 0.418 for the Greenshield, Greenberg and Underwood methods... By using the Greenshield method, it is also known that there are 6 time periods where Demand exceeds the capacity of the Maros River bridge with a shock wave value in the period of 07.30 – 07.45 of w = -38.42 km/hour, period of 16.15 – 16.30 of w = - 124.43 km/hour, period at 16.30 – 16.45 at w = -42.82 km/hour, period at 16.45 – 17.00 at w = -39.76 km/hour, period at 17.00 – 17.15 at w = -7, 32 km/hour and in the period 17.45 – 18.00 at w = -21.53 km/hour. Shock waves due to road narrowing from 3 (three) lanes to 2 (two) lanes with a repeated duration of normal road volume conditions greater than the volume of bottleneck roads, there are three shock waves formed at t1 on the stop line, namely wAB of -15, 13 km/hour, wCB of -14.42 km/hour and wAC of -38.42 km/hour in the period 07.30 – 07.45.
Greenshield, Greenberg, Underwood, Traffic Performance, Bottleneck, Shock Wave