Ren Gang

SAE for the prediction of road traffic status from taxicab operating data and bus smart card data

Road traffic status is significant for trip decision and traffic management, and thus should be predicted accurately. A contribution is that we consider multi-modal data for traffic status prediction than only using single source data. With the substantial data from Ningbo Passenger Transport Management Sector (NPTMS), we wished to determine whether it was possible to develop Stacked Autoencoders (SAEs) for accurately predicting road traffic status from taxicab operating data and bus smart card data. We show that SAE performed better than linear regression model and Back Propagation (BP) neural network for determining the relationship between road traffic status and those factors. In a 26-month data experiment using SAE, we show that it is possible to develop highly accurate predictions (91% test accuracy) of road traffic status from daily taxicab operating data and bus smart card data.

Performance Evaluation of Bus Routing Scheme During Subway Construction Using Fuzzy Aggregation

To evaluate the layout adjustment scheme of bus line during subway construction, the method combining quantitative survey and fuzzy aggregation is used. One criterion is transit service level, which considered nonlinear coefficient, line length, transfer distance and average waiting time. Another criterion is traffic impact degree incorporating three factors: saturation degree on work-zone section, saturation degree at intersection, passenger volume. The fuzzy aggregation is based on these two criteria. The evaluation method is applied in Ningbo of China. Via quantitative survey, it is found that most of the factors with respect to these two criteria are degraded, when the bus routing scheme comes out during the construction of subway # 1. For instance, new layout such as bus line relocation and bus stop displacement increases traffic volume on some of the south-north links. Most of these links intersect with work-zone links on Zhongshan Road. However, when comparing the evaluated performance of bus line adjustment condition to the one of previous condition under subway construction stage, the gap is well within the acceptable limit. Therefore, the increased traffic may affect the traffic passing on some south-north roads, but will not hinder citizens daily travel. These analysis and evaluation of bus routing scheme provide reference for the subway construction in other cities with respect to road traffic management.