Abstract
Traffic performance have been measured based on degree of saturation, velocity, travel time, and delays. However, they weren’t enough to measure the traffic fluctuation that happen on normal days. This study aims to develop some modified analysis about traffic congestion based on the degree of saturation (DS) and travel time ratio (TTR). The travel time ratio is defined as a ratio between the travel time at peak hour and the travel time at off-peak hour in a certain road section. Traffic congestion conditions are classified into 4 categories: Peak-hour Congestion, Lengthy Congestion, Momentary Congestion, and Smooth Traffic. Based on survey results on road sections in Palembang, Bandung, Yogyakarta, and Surakarta, it can be concluded that peak-hour congestion occurs when TTR > 1,40 and DS > 0,75, lengthy congestion occurs when TTR < 1,40 and DS > 0,75, momentary congestion occurs when TTR > 1,40 and DS < 0,75, and smooth traffic when TTR < 1,40 and DS < 0,75.
Highlights
Traffic and road transport as mandated by Indonesian Government [1] must have criteria for a secure, safe, orderly, smooth, and integrated with other transport modes
Traffic performance is measured by the degree of saturation
It often occurs a smooth traffic flow on a road which has a degree of saturation above one or vice versa
Summary
Traffic and road transport as mandated by Indonesian Government [1] must have criteria for a secure, safe, orderly, smooth, and integrated with other transport modes. Conditions of congestion based on the degree of saturation and the travel time ratio are classified into four types as shown, namely: a) Peak hour congestion: a condition of congestion where there are high traffic flow and activities at peak hours (0,5-2 hours) resulting significant delays and low speed. Both the degree of saturation and the travel time ratio on this road section are high. The degree of saturation is high but the travel time ratio is low This condition expectedly happens on road sections in downtown of major cities. The geometry survey was conducted to identify the width and number of lanes, the median, the width of road shoulders/curb, and the land use/side friction along the road sections to calculate the road capacity
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