Link-level vulnerability indicators for real-world networks (poster)

Literature proposes link-based indicators as predictors of the delay caused by a blockade on a particular link. This paper cross-compares these indicators and compares them with the result of a full simulation. The indicators predict different links to be vulnerable. Furthermore, the indicators do not provide a good indication of the delay of a...

Link-level vulnerability indicators for real-world networks

It is computationally expensive to find out where vulnerable parts in a network are. In literature a variety of methods were introduced that use relatively simple selection criteria (measured in real-life or calculated in a traffic simulator) to pre-determine the seriousness of the delays caused by the blocking of that link and thereafter...

Road Incidents and Network Dynamics: Effects on driving behaviour and traffic congestion

Incidents cause a large part of the congestion on the road. This PhD study describes how people change their behaviour when facing an incident situation. It is found that car-following behaviour changes and drivers react slower on their predecessors. Furthermore, it is found that drivers change their route when facing unexpected delay caused by...

Capacity Reductions at Incidents Sites on Motorways

Incidents cause a large part of the delays in road networks. This is caused by a decrease of the capacity at the incident site. A detailed knowledge of the queue discharge rate can improve for instance the traffic prediction and thereby improve delay information or routing advice. Therefore, this study determines the queue discharge rate for...

Verkeersmanagement bij exceptionele omstandigheden

Hoe kwetsbaar onze verkeersinfrastructuur is, blijkt wel bij exceptionele omstandigheden. Eén incident (calamiteit of ongeval) en er ontstaat een verkeersinfarct. Kan dit worden voorkomen? Zo ja, hoe dan? Zijn er bruikbare modellen om effecten in te schatten? En hoe staat het met de human factor, welhaast in elke keten de meest kwetsbare schakel...

Microscopic Traffic Behaviour near Incidents

Much of the delays on road networks are caused by incidents. This is partially caused by blockage or closure of lanes, but also by the change of driving behaviour in the remaining lanes. This contribution analyses traffic flow conditions near an incident both microscopically and macroscopically. A theory is proposed to describe drivers’...

Delay of Incidents Consequences of Stochastic Incident Duration

The delay caused by an incident depends on many variables. This paper introduces an analytical expression for the delay, describing the location and length of the queue by shockwave theory. As long as the congestion remains on the same link, delay is proportional to the square of the duration, even in case the outflow is reduced by a junction...

Delay of Incidents Consequences of Stochastic Incident Duration (poster)

The delay caused by an incident depends on many variables. This paper introduces an analytical expression for the delay, describing the location and length of the queue by shockwave theory. As long as the congestion remains on the same link, delay is proportional to the square of the duration, even in case the outflow is reduced by a junction...

Empirical differences between time mean speed and space mean speed

Insight into traffic flow characteristics is often gained using local measurements. To determine macroscopic flow characteristics, time aggregation of microscopic information is required.<br/><br/>Usually, a data collection system stores values averaged over time. However, it is well known that a time mean average overestimates the influence of...

The Influence of Spillback Modelling when Assessing Consequences of Blockings in a Road Network

Robustness of a network is a main objective for road network managers these days, and has therefore become an important study area for transportation scientists. This article discusses one specific aspect in assessing road network robustness: the consequences of the closure of a link. These spillback effects have been examined in a dedicated...

Comparison of link-level robustness indicators

Much of the delay in transport networks is caused by incidents. Many indicators are developed to determine vulnerable parts of a network without simulating the network flows with an incident on each of the links. This paper lists indicators proposed in literature and cross compares them. Their values for all links on three networks of different...

Design of twisted cavitating hydrofoil using a barotropic flow method

Transformatie van kantoorgebouwen: Sturingsmiddelen om herbestemming van kantoorpanden te bevorderen

Al enkele jaren is er op ruime schaal sprake van structurele leegstand in kantoorgebouwen. In 1996 heeft de kantorenmarkt zich hersteld en is de vraag fors toegenomen. Dit herstel heeft zich in 1997 met name doorgezet in het midden- en topsegment. In diverse deelmarkten verbeteren de huurprijzen en neemt de leegstand af. Een groot deel van de...

Overheid moet herbestemming kantoren stimuleren

Langdurige leegstand van kantoorgebouwen is maatschappelijk en economisch onge-wenst. Herbestemming naar woonfuncties kan een goede oplossing zijn. Onderzoek van de Technische Universiteit Delft wijst uit, dat de overheid en marktpartijen de noodzaak tot stimulering van herbestemming onderschrijven. Integrale gebiedsontwikkeling, fis-cale...