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Summary of IOT Publications
Title | Develop and calibrate the Highway Traffic Systems Simulation Model and revise Taiwan Highway Capacity Manual(3/3) |
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Dept | Transportation Planning and Land Transport Division |
Year | 2019 |
Month | 10 |
Price | 480 |
Summary | Several sections of the Taiwan Highway Capacity Manual (THCM) needed revision, partly in response to changes in characteristics of traffic flows. From 2016, IOT works under three-year plans. On the basis of volume research outcomes in recent years, data needed to be complemented through onsite research and the Highway Traffic Systems Simulation needed finetuning. This all would necessitate revising various sections in the new edition of THCM. This year’s work used highway vehicle volume detection data to analyze traffic flows through highway tunnels and to develop analytical methods for service levels. Outcomes included: (1) draft a new chapter on highway tunnels; (2) revise Chapter 4 Freeway Basic Segments of the 2011THCM; (3) finetune the 2018 Highway Traffic Systems Simulation Model (2018HTSS model) for analysis of freeway basic segments; and (4) add new chapters to the THCM. IOT found that the traffic volume of Highway 5 is far lower than that of Highway 3. The data collected by the detectors show that on basic highway sections, traffic flows rarely exceed 1,900 vehicles/hour/road section. Opening road shoulders to traffic will add only 50-60% of the volume of one lane. In road planning, counting large vehicles as 1.4 small vehicles will help prevent underestimating traffic flow demand; this conversion doesn’t work well on slopes, though. Instead, a formula for vehicle acceleration/deceleration for compound vehicles going uphill/downhill (based on 123 kg/kW) helps better predict intervehicle distances and thus the geometric design of high sections on slopes. |
Post date | 2019-10-07 |
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