An Operating Speed Model for the Uniform-Speed Section of Interchange Ramps

Interchange ramp operation is an important part of the highway operating speed system. The uniform-speed prediction model is one of the most important parts of the ramp. This paper examines the prediction model and fitting method for the uniform-speed section of interchange ramp. First, we analyzed the influence factor and applicability of current models, and four prediction model equations are determined from the perspective of mechanical balance equation. Second, we obtained a linear regression model with variable transformation to predict the operating speed of the uniform speed section of the ramp. Then, we verified the fitting formula and determined its validity through data computation. Finally, the accuracy of the model is verified by actual observation data. The results show that the average relative errors of large and small vehicles were 7.4% and 7.2%, respectively, which verifies that this model has real world applicability.