Evaluation of the effectiveness of accident information on freeway changeable message signs: A comparison of empirical methodologies

2014 ◽  
Vol 48 ◽  
pp. 158-171 ◽  
Author(s):  
Yiguang (Ethan) Xuan ◽  
Adib Kanafani
Keyword(s):  
Changeable Message Signs ◽  
Message Signs

Driver Understanding of Sequential Portable Changeable Message Signs in Work Zones

2007 ◽  
Vol 2015 (1) ◽  
pp. 28-35 ◽  
Author(s):  
Brooke R. Ullman ◽  
Gerald L. Ullman ◽  
Conrad L. Dudek ◽  
Alicia A. Williams
Keyword(s):  
Work Zones ◽  
Changeable Message Signs ◽  
Driver Understanding ◽  
Message Signs

Influence of Exposure Duration on the Effectiveness of Changeable-Message Signs in Controlling Vehicle Speeds at Work Zones

1998 ◽  
Vol 1650 (1) ◽  
pp. 62-70 ◽  
Author(s):  
Nicholas J. Garber ◽  
Srivatsan Srinivasan
Keyword(s):  
Threshold Value ◽  
Video Camera ◽  
Work Zone ◽  
Second Phase ◽  
Volume Data ◽  
Work Zones ◽  
Two Phase ◽  
Changeable Message Signs ◽  
Study Sites ◽  
Message Signs

In work zones, drivers do not slow down in response to conventional signs. Changeable-message signs (CMSs) equipped with a radar unit can be used to display specific warning messages to speeding drivers. The radar unit detects the speed of each vehicle entering the work zone and can be programmed to activate the CMS if the speed of the vehicle exceeds a preset threshold value. A two-phase longitudinal study was conducted. The first phase, conducted by Garber and Patel, examined the short-term effectiveness of the CMS with radar in reducing vehicle speeds in work zones. The second phase, some of the results of which are presented, evaluated the influence of the duration of exposure of the CMS with radar on its effectiveness in reducing speeds in work zones. Speed and volume data for the population were collected at the study sites by automatic traffic counters placed at the beginning, middle, and end of each work zone. In addition, the speeds of individual drivers who triggered the CMS by exceeding the threshold speed were also recorded (using a video camera) at two other locations within the work zone for several weeks and analyzed. The results of the study indicated that the duration of exposure of the CMS does not have a significant impact on speed characteristics and driver behavior. Therefore, the CMS continues to be effective in controlling speeds in work zones for projects of long duration. The results also indicated that the CMS with radar reduces the probability of speeding at work zones and that this effect is maintained for at least up to 7 weeks.

Locating changeable message signs for advanced traffic information and management systems

2007 ◽  
Vol 34 (5) ◽  
pp. 651-663 ◽  
Author(s):  
Liping Fu ◽  
Jeffrey Henderson ◽  
Shuo Li
Keyword(s):  
Queuing Theory ◽  
Traffic Information ◽  
Planning Problem ◽  
Multiple Time ◽  
Driver Behaviour ◽  
Traffic Demand ◽  
Proposed Model ◽  
Changeable Message Signs ◽  
Model Realism ◽  
Message Signs

This paper presents an optimization model for locating changeable message signs (CMSs) on an integrated freeway-arterial network. Compared with existing models, the proposed model represents a well-balanced compromise between computational efficiency required to solve problems of realistic size, and model realism to ensure the quality of solutions. The model has three unique features: (1) it recognizes that locating CMSs is a planning problem that must take into account both current and future needs and benefits, (2) it evaluates benefits of CMSs over multiple time periods with different traffic distributions, and (3) it explicitly considers inherent variations in incident characteristics across links and over time. A sensitivity analysis is performed to examine the potential impacts on optimal CMSs locations resulting from uncertainties in various input parameters, such as traffic demand, incident attributes, and driver behaviour. Lastly, the proposed model is applied to the Highway 401 express-collector freeway system in Toronto for relocating the existing CMSs.Key words: changeable message signs (CMSs), location optimization, traffic assignment, queuing theory.

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