2013 Session: 695

• Investigation of Truck Capacity-Influencing Factors at the Approach of Highway Signalized Intersections in China
  Abstract: The increasing number of trucks traveling on the highway has become a great challenge to the capacity calculation at the approach of highway signalized intersections, because of the interactions among cars, trucks, buses and so on. This study investigated and developed modified heavy-truck adjustment model by considering the effects of vehicle type, vehicle position and lane-changing behaviors at the approach of highway signalized intersections. From observations and model analysis, we can conclude: 1) The effects of heavy-duty truck and combination truck on capacity were underestimated by the current standards; 2) Vehicle position has a substantial influence on the capacity of the approach lanes; 3) Lane changing behaviors cause capacity reduction especially when the forced lane-changing occurs; 4) The impacts of trucks and speed advantage are the key factors to motivate the lane-changing behaviors at approach lane.
  Authors: Yang, Jianhao; Sun, Jian
  Authors: Yang, Jianhao; Sun, Jian
  Year: 2013
  Document Type: Paper
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-2703
• Nationwide Establishment and Freight Survey: Descriptive and Nonresponse Bias Analyses
  Abstract: This paper investigates the results generated by a recently completed online freight establishment study. The survey was assembled with the intention of supplementing a previous survey, which was utilized in the formation of an activity-based freight demand model known as the Freight Activity Microsimulation Estimator (FAME). The data will be used to formulate new or enhance existing pieces of the freight model such as the shipping chain and supplier selection elements. Within this paper is an overview of the steps taken in designing and implementing the establishment and shipment questionnaires of our freight survey. Following that is a descriptive analysis of the results of key questions posed in our survey. Additionally, in an effort to avoid constructing models based on data suffering from selection bias, a non-response bias analysis was performed on the data.
  Authors: Sturm, Karl; Pourabdollahi, Zahra; Mohammadian, Abolfazl
  Authors: Sturm, Karl; Pourabdollahi, Zahra; Mohammadian, Abolfazl
  Year: 2013
  Document Type: Paper
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-3872
• Economic Analysis of Onboard Monitoring Systems in Commercial Vehicles
  Abstract: On-board monitoring systems can be used in commercial vehicle operations to monitor driving behavior, with the goal of enhancing safety. While it is known that improved safety will produce an economic benefit to carriers, understanding how this benefit compares to system costs is an important factor for carrier acceptance. In addition to the safety benefits provided from using on-board monitoring systems, operational improvements may also have economic benefits. This research provides a better understanding of the economic implications of on-board monitoring systems from the perspective of the carrier through a benefit-cost analysis (BCA). In addition to the benefits of reduced crashes, benefits associated with electronic recording of hours of service, reduced mileage, and reduced fuel costs are considered. A sensitivity analysis is used and demonstrates that on-board monitoring systems are economically viable under a wide range of conditions. Results indicate that, for some fleet types, reducing crashes and improving HOS recording, provides a net benefit of close to $300,000 over the five-year expected lifespan of the system. Furthermore, when exploring additional benefits such as reduced fuel consumption and reduced vehicle miles, benefits can be upwards of seven times more than safety-related benefits. This research also shows that net positive benefits are possible in large and small sized fleets. Results can be used to inform policies for motivating or mandating carriers to use such systems, and to inform carriers regarding the value of system investment.
  Authors: Pitera, Kelly; Boyle, Linda Ng; Goodchild, Anne
  Authors: Pitera, Kelly; Boyle, Linda Ng; Goodchild, Anne
  Year: 2013
  Document Type: Paper
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-1259
  Practice-Ready: Yes
• Truck Parking and Traffic on I-5 in California: Analysis of a Clipboard Survey and Annual Average Daily Traffic Data
  Abstract: Truck parking is a major problem on I-5 in California as truck drivers regularly encounter parking that is at or near capacity, particularly when searching for overnight parking. This creates safety hazards for truck drivers as well as the traveling public. This study reports on the results of a clipboard survey of truck drivers (N = 85) on I-5 in California in Spring 2012. The survey focused on understanding the challenges faced by long haul truck drivers parking in the region and to evaluate the degree to which ITS applications in truck parking, such as real-time parking availability information, would be useful. The survey found that more than 70% of respondents (n=61) indicated that they had encountered truck stops where they would have liked to park but could not because it was full. About 30% of truck drivers stated that they would keep driving under such circumstances. More 50% of truck drivers reported that they encountered truck stops too full to park on I-5 at least every other day, and they predominantly encounter full parking when looking to stop overnight. In addition to completing the survey, researchers developed an approach to illustrate truck traffic over a corridor using Average Annual Daily Traffic (AADT) data. This approach to displaying public information can be used to help understand where truck parking demand is likely highest, as well as to help quantify long-haul truck traffic over specific segments of a highway corridor.
  Authors: Martin, Elliot W.; Shaheen, Susan A.
  Authors: Martin, Elliot W.; Shaheen, Susan A.
  Year: 2013
  Document Type: Paper
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-5353
• Understanding Truck Route Choice: Implications for Travel Models
  Abstract: This article identifies the truck routing priorities of freight companies through a survey of Washington State shippers, carriers, and receivers. To elicit these priorities, the survey prompted the respondents to score fifteen routing items with respect to each item’s influence on route choice. Item response theory and latent class analysis illuminated priorities that were common among all survey respondents and priorities that were differentiating among the sample. Minimizing cost and meeting customer requirements were priorities for all. The influence of other items such as road grade, hours of service limits, and driver availability depended on whether the respondent was best described as a long-haul, local-regional, or urban trucking provider. These three classes of companies were derived from the latent class analysis, and each class has a distinct response pattern to the fifteen routing items. This result suggests that truck routing priorities are not constant and uniform across a state’s trucking industry but rather variable and dependent on trip length. The paper concludes with recommendations as to how these priorities can be implemented within a truck routing model.
  Authors: Rowell, Maura; Gagliano, Andrea; Goodchild, Anne
  Authors: Rowell, Maura; Gagliano, Andrea; Goodchild, Anne
  Year: 2013
  Document Type: Paper
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-3051
  Practice-Ready: Yes
• Economic Analysis of Onboard Monitoring Systems in Commercial Vehicles
  Authors: Boyle, Linda
  Authors: Boyle, Linda
  Year: 2013
  Document Type: Presentation
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-1259
• Understanding Truck Route Choice: Implications for Travel Models
  Authors: Goodchild, Anne
  Authors: Goodchild, Anne
  Year: 2013
  Document Type: Presentation
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-3051
• Investigation of Truck Capacity-Influencing Factors at the Approach of Highway Signalized Intersections in China
  Authors: Sun, Jian
  Authors: Sun, Jian
  Year: 2013
  Document Type: Presentation
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-2703
• Nationwide Establishment and Freight Survey: Descriptive and Nonresponse Bias Analyses
  Authors: Sturm, Karl
  Authors: Sturm, Karl
  Year: 2013
  Document Type: Presentation
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-3872
• Truck Parking and Traffic on I-5 in California: Analysis of a Clipboard Survey and Annual Average Daily Traffic Data
  Authors: Martin, Elliot
  Authors: Martin, Elliot
  Year: 2013
  Document Type: Presentation
  Subject: Freight Transportation
  Session: 695
  Paper Number: 13-5353