Yulin Chang

Signal Optimization Design of the Mid-Block Crosswalk

This paper proposes the traffic signal optimization design for the street crosswalk between coordinated adjacent intersections. The design has taken the pedestrian waiting tolerance limit time into consideration as one of the constraint conditions to obtain the pedestrian green phase duration. If the green phase duration is not sufficient for pedestrian crossing safety, the methods of twice crossing street or two chances of crossing can be applied according to different situations. The common red time of two intersections is analyzed to build delay functions by using of motorcade dispersion and traffic flow rate relationship, and timing optimization parameter can be worked out to minimize the total vehicle delay, thus determining signal phase difference. The result shows that this design may ensure the pedestrian safety and reduce the pedestrian delay.

The Quantitative Model of Curb Parking Impacts on Traffic Flow Delay

This paper presents a quantitative analysis model of curb parking impacts on traffic flow delay. Whether a road is appropriate setting curb parking is quantitatively analyzed. Based on the variation of traffic delay on a road with curb parking lots, the impacts of curb parking facilities on traffic flow are analyzed. The traffic delay caused by curb parking activities that under both low and high volume conditions are researched. A model respectively using discrete, continuous values of delay as evaluation indicator is built. The validity of the model is tested through application examples.

A New Timing Design and Evaluation Method of Green Wave

In this paper, a new kind of timing design method of green wave intersection is proposed based on the theory used in green wave design. Also in this paper, a new kind of evaluation method of green wave design is put forward. Proven by practical examples, both methods are proven to be useful and effective.

Analysis of Structural Energy-Saving Potential in Transportation Industry: A Case Study of Zhejiang Province

With the contraction between energy-consumption and energy-reserve intensified, saving energy has become essential to the development of economy. Transportation, a fundamental industry of the national economy, consumes a huge amount of energy, so it becomes a typical field to save energy. Based on the Regression Analysis Prediction Model, the Growth Curve Prediction Model and the Elastic Coefficient Prediction Model, a Combined Prediction Model is designed in this paper to forecast the passenger and freight volume of Zhejiang Province in 2015, the final phase of the National Twelfth Five-Year Plan. With the volume data of 2015 predicted, an energy-saving mathematical model is built to calculate the amount of energy saved in Zhejiang Province after optimizing the transportation structure and improving the transportation technology. The result shows that the transportation field in Zhejiang has a great energy-saving potential.

Research of Signalized Intersection Delay Model by Using Optimization Method

By using optimization method, this paper has set up vehicle delay models of signalized intersection which based on vehicle average delay minimum, each phase remain time equal and each phase remain time balance. By using a real intersection’s geometry and traffic flow data, this paper has also set up the phase time with the above models, studied the results and evaluated these models

OD Matrix Survey Method of Passenger Flow Based on Google Maps

This paper analyzes the deficiencies of the traditional method of passenger origin-destination (OD) survey as well as provides a new transport investigation method based on Google Maps. Through a friendly user interface platform, the method eliminates the need for manual data entry by using a standardized form of data. While avoiding the separation of the survey and the statistics, it also greatly enhances the credibility of the data and saves the costs of survey and data entry. Moreover, the method increases interest, reduces the work intensity, and improves the accuracy. In all, vast vistas are opened up through this method.