Impacts of traffic management (May 2015)
Since 2008 an overview exists in which the results of (almost) all assessment studies for traffic management in The Netherlands are summarised. This is an important source of knowledge related to impacts of traffic management and is useful for policy and operations. TrafficQuest has updated this overview with the latest results and it contains now the research of 190 reports. The references of these reports are given in the de reference list. As usual, the number are contained in tables, given in this overview. Both are in Dutch.
Failure rush hour lane system A1
On Tuesday morning November 4th, 2014 a failure occured in the motorway management system near motorway junction Hoevelaken, causing the rush hour lane on the A1 between Hoevelaken and Barneveld to be closed. The rush hour lane could not be used during the evening peak leading to heavy congestion in the neighbourhood. Rijkswaterstaat wanted to know what the effects of this failure were on the traffic operations in the area. Detours were implemented, but still the queues were longer than normal. A system failure like this gives extra delay and Rijkswaterstaat wanted to know the size and the costs of this extra delay. TrafficQuest has done a quick scan analysis (in Dutch) with the available data. The costs turned out less than expected. But nevertheless Rijkswaterstaat will check and if necessary improve the maintenance process.
Model predictive control for intersections
At intersections that are controlled by vehicle-actuated controllers the movements receive green in a fixed order. The number of waiting vehicles, the time they are waiting, whether a platoon approaches, etc. are not taken into account. The result is a neatly arranged control plan, but also a way of control that is not capable of minimising the total loss for the complete intersection. Model predictive control (MPC) determines its next control action on predictions of the effect of different combinations of control actions in time. In a Dutch presentation for different groups of traffic engineers Ronald van Katwijk provided the participants with a better insight into the possibilities of MPC for the current practice and for the future.
At the eind of last year the workprogram for 2015 was approved by the supervisory board of TrafficQuest. In the workprogram the topics are described which TrafficQuest will be working on in 2015. Important topics are urban traffic management, a continuation of the workshop in July 2014, automatic driving and an upate of the succesful publication 'Traffic in the Netherlands'. Besides that TrafficQuest will contribute to projects and will give advice. Also state-of-the-art-reports are planned, because there is a need for this kind of reports. So, enough work to continu the help TrafficQuest can provide.