Cost functions are commonly used in traffic assignment to account for the effects of congestion on road link performances. Despite their influence on assignment results, not many functions are available for estimating travel times on urban or suburban roads. In particular, on road belonging to historical cities or on roads surrounded by urbanized areas. The solution usually adopted either does not consider the effect of congestion on the travel time, or are based on the Bureau of Public Roads (BPR) function. Nonetheless, traffic flow disturbances like side-parking can appreciably affect link travel time with the rise in congestion, especially in the roads of ancient centres. The aim of this paper is threefold: first, to calibrate and validate a travel time function for urban road links; secondly, to investigate the transferability of the cost function to a set of suburban roads; finally, to re-calibrated the cost function on the same suburban context to investigate the possible improvements. The cost function included the effect of side-parking, secondary streets and road winding on the worsening of performance due to congestion. Cross-validation results showed the robustness, the transferability the applicability of the calibrated cost function

Calibration and transferability of travel time cost functions for urban and suburban roads: a case study in Italy

DE LUCA, STEFANO
2014

Abstract

Cost functions are commonly used in traffic assignment to account for the effects of congestion on road link performances. Despite their influence on assignment results, not many functions are available for estimating travel times on urban or suburban roads. In particular, on road belonging to historical cities or on roads surrounded by urbanized areas. The solution usually adopted either does not consider the effect of congestion on the travel time, or are based on the Bureau of Public Roads (BPR) function. Nonetheless, traffic flow disturbances like side-parking can appreciably affect link travel time with the rise in congestion, especially in the roads of ancient centres. The aim of this paper is threefold: first, to calibrate and validate a travel time function for urban road links; secondly, to investigate the transferability of the cost function to a set of suburban roads; finally, to re-calibrated the cost function on the same suburban context to investigate the possible improvements. The cost function included the effect of side-parking, secondary streets and road winding on the worsening of performance due to congestion. Cross-validation results showed the robustness, the transferability the applicability of the calibrated cost function
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4267053
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