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• W631736339 abstract "The crossing and turning manoeuvres that occur at intersections create opportunities for vehicle-vehicle, vehicle-pedestrian, and vehicle-bicycle conflicts. Because of these conflicts, intersections are likely points for concentrations of traffic crashes. To minimize crash frequency and severity, appropriate intersection traffic control type should be chosen. Good geometric design combined with good traffic control can result in an efficient and safe intersection. As population and development increases, trafficvolume and the number of crashes grow. There is an increasing demand for signalization at urban and suburban intersections even in rural areas. However, experience shows that intersection crash rates frequently increase with signal installation, although the crashes may be less severe. Signalization usually leads to a shift in crash types, with fewer angle and turning collisions and more rear-end collisions. Some collisions at unsignalizedintersections occur because drivers have difficulty in judging gap sizes before deciding whether to initiate a roadway entry or a turning manoeuvre. Drivers stopped to wait for the oncoming traffic stream often choose to proceed when oncoming vehicles are close, thus increasing the probability for a collision. Some precautions could be taken to improve safety at unsignalized intersections. For this purpose the availability of gaps in traffic stream could be arranged and automated systems can be used to assist drivers in judging gap sizes in traffic stream for entering the major road from a controlled approach. The signal timing can be modified to create longer gaps. Some crashes can be minimized if longer gaps can be made available. Unsignalized intersections are often modeled with an assumption of random vehicle arrivals. However vehicle arrivals are not random where nearbyupstream signalized intersections cause platoons. The queues that form ateach signalized intersection during the red phases will disperse as they travel downstream away from the signalized intersection. A platoon departsfrom a signalized intersection during the green phase at a particular flow rate but the platoon is dispersed by the time it passes a point downstream. The presence of upstream signal effect is commonly an encountered condition that is not adequately accounted for capacity calculations and safety evaluation. The purpose of this study is to evaluate the effects of distance between the signalization and unsignalized intersection on the statistical distribution of gaps in major traffic stream and the usefulness of these gaps to the minor stream drivers. At the capacity calculations HCM 2000 procedure and a simulation program is used. The use of Cowan m3 distribution is also investigated for the main road vehicles. For the headways especially bigger than the critical gap values Cowan m3 distribution fits the observed values. To observe the efficiency some signalized and unsignalized intersection specimens in Izmir Turkey are taken into consideration. For the covering abstract see ITRD E137145." @default.
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• W631736339 date "2007-01-01" @default.
• W631736339 modified "2023-09-27" @default.
• W631736339 title "The collision points on unsignalised intersections and the effect of upstream signals" @default.
• W631736339 hasPublicationYear "2007" @default.
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