The study of effect pavement failure level on vehicle speed (case study: Padang Lua highway).

Padang Lua Highway, Banuhampu District, Agam Regency is the primary arterial, a national road. There were types of pavement damage that occurred in several segments of the road. Road damage that occurs causes inconvenience to road users, such as a reduction in the speed of vehicles passing through the road. In this study, 1 km length of the road was studied. The length of the road studied was divided into 5 segments, each segment is 200 meters apart, which means for the 2-way roads studied, there were 10 segments. There are three types of data collected, namely road pavement failures data, vehicle speed, and vehicle volume. Road pavement failures surveys were carried out to obtain a PCI (Pavement Condition Index) value. Data collection was carried out using the inventory technique, by walking along the road to measure road damage per 200 meters. The recording of types and dimensions of damage is carried out on types of pavement damage. The vehicle speed survey was carried out using the Moving Car Observation method. The traffic volume survey is obtained by recording 3 types of vehicles and the direction of their movement across the road section by means of a manual survey. The results of the recording are entered in the form that has been provided previously, which are grouped according to the direction and flow of vehicles. This observation method was carried out based on PKJI, 2014 method. Furthermore, in the data analysis, the value of road conditions (PCI value) is sought for the studied road segment. Linear regression analysis was carried out to determine the effect of the level of road damage on vehicle speed (PCI value). F test was carried out to find out whether the effect was significant or not. The results showed that the types of damage that mostly occurred were alligator cracks, block cracks, edge cracks, patches, swelling, and weathering or raveling. However, in general, the condition of Padang Lua Highway, Banuhampu District, Agam Regency is in very good condition (very good) with an average PCI value is 56.15. The results of this analysis indicate that the vehicle speed decrease as the increasing of road damage level. In the regression analysis obtained a model, Y = 16,892+0,2051x, whereas, Y is the vehicle speed and x is the level of road damage, the effect of the level of road damage on vehicle speed is significant. [ABSTRACT FROM AUTHOR]