Impact of Roadside Fixed Objects in Traffic Conditions

Abstract

Highway Capacity Manual (HCM) assumes that traffic flow rates are equally distributed between lanes, which is not always the case. Lane distribution and speed are influenced by lateral clearance on the roadsides. In Jordan, the absence of well-marked lanes and poor lane discipline results in under-utilizing of the freeway capacity. The objective of this study is to look into the impact of the presence of roadside objects on lane distribution and speed. Test sections were selected on six-lane freeway segments located in sub-urban areas on tangent highway segments. Speed measurements and distribution counts made for each lane on a directional three-lane segment of the freeway. The results showed that lane distribution significantly varies depending on lateral clearance and traffic. As lateral displacement increases, right-lane-use and left-lane-use increases while the middle-lane use remains almost at the same level. Average speed increases as the lateral clearance increases. The results also showed that average speed and lane distribution for 1.5m lateral clearances are very similar to no obstacle conditions. The impact of an obstacle is more significant on the right lane while the use of the left lane fluctuates with a significant increase if traffic flow rates reach high levels.

Measures of Functional Reliability of Two-Lane Highways

“…Existing literature [82] allows us to find a categorization of PTI values in terms of service reliability level developed for practical use by road users, as well as road managers. It is recommended that the thresholds be adapted to the nature of the road (Table 2) [67]. PTI is one of the variants of TTI, or travel time index, which can be calculated for any percentile (Equation ( 11)) .…”

“…Road surroundings [66,67] and weather conditions [68][69][70]. The diagram in Figure 1 shows interactions between the main sources of failure and the relationship between demand (traffic) and supply (infrastructure).…”

Enhancing Roadway Efficiency through Comprehensive Studies on Travel Time, Delays, and Spot Speeds

“…Roadway efficiency and smooth traffic flow are affected by lateral clearance, lane distribution, and fixed objects in roads [4]. Side friction, referring to events or behaviors happening alongside or directly on the road, detrimentally affects the smooth flow of traffic, leading to several consequences including diminished road capacity and lane width, alterations in travel velocity, instant speed, Space Mean Speed (SMS), and Time Mean Speed (TMS), thereby influencing overall road performance [5]. This article embarks on an enlightening journey, drawing profound insights from a meticulous and exhaustive comprehensive traffic study.…”