tailieunhanh - CAR FOLLOWING MODELS BY RICHARD W. ROTHERY

This document is a legally binding contract of insurance between you and us. Please read the definitions on page 6 of this document. The information you submitted in the Proposal Form or Statement of Insurance forms the basis upon which we have agreed to provide cover. If you know or believe that any information is incorrect or missing, please tell your insurance adviser immediately. If you do not give us accurate and complete information, your insurance may not be valid and we could refuse to pay any claim. If you need a copy of the Proposal Form or Statement of Insurance, please ask your insurance adviser. We have. | Courtesy of Richard W. Rothery. Used with permission. CAR FOLLOWING MODELS BY RICHARD W. ROTHERY6 6 Senior Lecturer Civil Engineering Department The University of Texas ECJ Building Austin TX 78712 CHAPTER 4 - Frequently used Symbols a Numerical coefficients . Collision time a m Generalized sensitivity coefficient T Reaction time aft Instantaneous acceleration of a following U Speed of a lead vehicle vehicle at time t Uf Speed of a following vehicle a t Instantaneous acceleration of a lead Uf Final vehicle speed vehicle at time t Uf Free mean speed speed of traffic near zero p Numerical coefficient concentration C Single lane capacity vehicle hour Ui Initial vehicle speed T Rescaled time in units of response time Urel Relative speed between a lead and T following vehicle Ỗ Short finite time period u t Velocity profile of the lead vehicle of a F Amplitude factor platoon y Numerical coefficient V Speed k Traffic stream concentration in vehicles V Final vehicle speed per kilometer 0 Frequency of a monochromatic speed kj Jam concentration oscillation km Concentration at maximum flow xft Instantaneous acceleration of a following kf Concentration where vehicle to vehicle vehicle at time t interactions begin xt t Instantaneous speed of a lead vehicle at kn Normalized concentration time t L Effective vehicle length f Instantaneous speed of a following vehicle L- Inverse Laplace transform at time t Ằ Proportionality factor x t Instantaneous speed of a lead vehicle at ki Sensitivity coefficient i 1 2 3 . time t ln x Natural logarithm of x f Instantaneous speed of a following vehicle q Flow in vehicles per hour at time t qn Normalized flow x t Instantaneous position of a lead vehicle at S Average spacing rear bumper to rear time t bumper xft Instantaneous position of the following Si Initial vehicle spacing vehicle at time t Sf Final vehicle spacing xi t Instantaneous position of the ith vehicle at So Vehicle spacing for stopped traffic time t S t Inter-vehicle spacing