01126689

Component

https://doi.org/10.3141/2130-13

http://scholar.google.com....+Su&publication_year=2009

The 12.9-km-long Shea-San Tunnel, located on Taiwan’s 54-km-long National Highway 5 (NH-5), has two one-way tubes. To minimize accidents and to respond to the need for improved operating efficiency on NH-5, Taiwan’s Bureau of National Highways adopts a graduated approach in traffic control. Before October 2007, the bureau set a uniform speed limit of 70 kilometers per hour (km/h) for NH-5 and allowed only passenger cars and other small vehicles to enter the Shea-San Tunnel and the adjacent Pern-San Tunnel. With the exception of the Shea-San Tunnel, the speed limit was raised to 80 km/h in October 2007. In November 2007, the bureau opened all the tunnels to commercial buses and, most recently, the bureau raised the speed limit in the Shea-San Tunnel to 80 km/h. One traffic regulation that remains unchanged is that motorists in the Shea-San Tunnel must maintain a minimum car-following distance of 50 m under normal conditions. The capacities of the two tubes in the Shea-San Tunnel are still low. This study uses detector data to examine the spatial and temporal variations of capacity, free-flow speed, passenger car equivalents of buses, and speed–flow relationship.

01147492

09-3061

English

pp 101-108

2009

Transportation Research Record: Journal of the Transportation Research Board

9780309142625

Print

Figures (10) ; References (8) ; Tables (1)

Following distance; Highway capacity; Highway traffic control; One way traffic; Speed limits; Traffic crashes; Traffic flow; Traffic regulations; Traffic speed; Vehicular tunnels

Pern-San Tunnel (Taiwan); Shea-San Tunnel (Taiwan)

Free flow (Traffic); Speed-flow relationships

Taiwan

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Jan 30 2009 7:27PM

• Assessing Quality of Progression with Cyclic Coordination Functions
• Capacities of Unsignalized Intersections Under Mixed Vehicular and Nonmotorized Traffic Conditions
• Capacity of Freeway Weaving Segments
• Capacity of U-Turns at Unsignalized Median Openings on Six-Lane Streets
• Delay Pattern Estimation for Signalized Intersections Using Sampled Travel Times
• Effect of Phase Countdown Timers on Queue Discharge Characteristics Under Heterogeneous Traffic Conditions
• Estimation of Freeway Work Zone Capacity Through Simulation and Field Data
• Estimation of Passenger Car Equivalents Based on Capacity Variability
• Field Evaluation of Model-Based Estimation of Arterial Link Travel Times
• Impedance Effects of Left-Turning Vehicles from the Major Street at a Two-Way Stop-Controlled Intersection
• Investigation of Peak Flow Variations: Preliminary Field Studies
• Level of Service Analysis of Freeway Weaving Segments
• Performance Measures for Truck Level of Service: An Exploratory Survey Analysis
• Prediction of User Perceptions of Signalized Intersection Level of Service Based on Fuzzy Neural Networks
• Replication of Work Zone Capacity Values in a Simulation Model
• Turbo Roundabouts: Estimation of Capacity
• Validating the Incremental Queue Accumulation Method for Left-Turn Delay Estimation