Evaluation of C-ITS and Automated Driving

For the Round Table 'Effects' (organised by DITCM and Connecting Mobility) TrafficQuest has contributed to a new way of looking at the evaluation of C-ITS and Automated Driving. It is a cyclic view on evaluation that has the advantage that not only the impacts of different systems and services are determined, but that these results are also put into perspective. This can be done using the results of other experiments or of experiments under different circumstances (meta-analysis), but also by relating the results to policy goals and drawing generic conclusions about the impact on a national level or with different penetration rates (scaling). Eventually, these steps lead to new questions and hypotheses, which can be tested in new experiments. An extensive description of the evaluation circle is given in a report 'Evaluation of C-ITS and Automated Driving'.

C-ITS and traffic safety

Several cooperative ITS services (C-ITS) are currently being tested in the Netherlands. With these in-car systems and services road users are informed, warned for certain situations on the road and advised to change their driving behaviour. It is expected that a lot of these services will be implemented in the coming years, not only on the motorway network but also in cities. Due to the experimental character of these services and their number and diversity, it is difficult to draw general conclusions about the (potential) effects. A lot about the impacts is still unclear. Rijkwaterstaat has asked TrafficQuest to do a quick scan on the effects of C-ITS, especially on road safety. The available literature was read and analysed and the numbers that were mentioned in these studies were summarised. The results of this quick scan are described in this memo (in Dutch).

Knowledge gaps for automatic driving in normal traffic

TrafficQuest keeps up with innovations in traffic management and therefore within this scope is occupied with the question how automatic driving influences traffic flow and traffic management. To explore this topic TrafficQuest wrote a note about all the things an automatic vehicle encounters while driving on a Dutch motorway. First in general, but also specifically when this vehicle drives on a busy weaving section and has to change a couple of lanes. This exploration produced a number of challenges, both for road operators as for car or truck manufacturers, and a list of research questions to TrafficQuest likes to call for attention. The memo is in Dutch and can be downloaded here.

Failure rush hour lane system A1

Gesloten_spitsstrook

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.

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