| Title | Development and Applications of a Model for Simulation of Traffic on Highway Grade Segments (1/3) |
| Dept | Transportation Planning and Land Transport Division |
| Year | 2014 |
| Month | |
| Price | |
| Summary | An ongoing effort by the Institute of Transportation (IOT) to revise the Taiwan Highway Capacity Manual is hampered by the lack of a suitable tool for analyzing the grade segments on various highways. To address this problem, the IOT initiated a 3-year research project to develop the needed tool. The first phase of this project, carried out in 2013, is aimed at developing a microscopic model capable of simulating the traffic operations on freeway grade segments that are far from ramp junctions. It involves the following tasks: (1) review literature; (2) identify the general flow characteristics of freeway segments based on existing data; (3) develop simulation models; (4) test and calibrate the models; and (5) describe procedures for using the models to assist in the geometric design and capacity analysis of freeway grade segments. The models developed in this phase include Traffic-on-Grade Simulation (TGS) Model and Speed-on-Grade (SOG) model. The SOG model is useful for geometric design applications. It also has to be used with the TGS model to facilitate capacity and level-of-service analysis. This research also shows that, for geometric design, tractor-trailer trucks, single-unit trucks, buses, and small vehicles can be represented by vehicles with a weight/horsepower ratio of 125, 64, 75, and 50 kg/kW, respectively. The TGS model will be enhanced in the next two phases of the IOT project so that it can also be used for analysis of the operations of freeway ramp junctions and two-lane rural highways. This report details the findings of the aforementioned Phase 1 tasks and provides instructions on the use the SOG and the TGS models. |
| Post date | 2014/07/24 |
| Hashtags |
View count:
125