TY  - JOUR
PY  - 2011//
TI  - Operating speed and speed differential for highway design consistency
JO  - Journal of transportation engineering
A1  - Castro, María
A1  - Sánchez, José F.
A1  - Sánchez, José A.
A1  - Iglesias, Luis
SP  - 837
EP  - 840
VL  - 137
IS  - 11
N2  - A critical factor in highway design is maintaining a good consistency with a road geometry that fits the drivers' expectations. Presently, highway geometric design consistency is usually evaluated on the basis of operating-speed profile analysis, which requires the use of operating-speed models. This paper presents research carried out in Colombia consisting of a study of vehicle speeds on tangents and curves of two-lane rural highways. Car speeds were measured on the approach tangent and at the beginning, middle, and end points of curves by using two radar meters. The operating-speed prediction models that were developed are described. The speed change experienced by drivers from tangent to curve was also studied, and a model is presented that predicts this change. Finally, the model developed for operating-speed prediction at the midpoint of curves was compared with equivalent models calibrated in other countries and applied to a Colombian highway. This comparative study highlights the importance of using speed-prediction models calibrated according to local conditions.<p /> <p>Language: en</p> 
LA  - en
SN  - 0733-947X
UR  - http://dx.doi.org/10.1061/(ASCE)TE.1943-5436.0000309
ID  - ref1
ER  -