Freeflow on the A13Traffic study and dynamic modeling

The traffic study consists in assessing the impact of implementing a free-flow toll system on the A13 and A14 freeways.

The objectives of this study were manifold:

• Quantification of time savings associated with the introduction of a free-flow toll system, based on FCD calculations and data;
• Verification of operation and presence of any hard points resulting from the removal of BPVs through dynamic modeling.

The scope of the study covers the stretch of A13 between Orgeval (intersection with the A14) and the Caen ring road, as well as the section of A14 including the Montesson BPV.

The first part of the study consisted in processing and analyzing these data to draw general conclusions about congestion at BPV today.

The second part consisted in estimating time savings by type of user (light vehicles and heavy goods vehicles), by type of route (full-lane or slip road) and by type of gain (stopping time on BPV or time saved thanks to the elimination of traffic jams). An estimate was made for certain days identified as typical days, then the annual values were calculated by interpolation.

The third part consisted in building a dynamic model to reproduce current traffic conditions on significant days, in order to assess the impact of removing the barriers. Analysis of the model results in the free-flow configuration was intended to identify any traffic bottlenecks or the postponement of certain tail-back phenomena.