Author: Steven L. JohnsonPublisher:
ISBN:
Category : Speed limits
Languages : en
Pages : 157
Book Description
Cost-benefit Evaluation of Large Truck-automobile Speed Limit Differentials on Rural Interstate Highways
Author: Steven L. JohnsonPublisher:
ISBN:
Category : Speed limits
Languages : en
Pages : 157
Book Description
Safety Effects of Differential Speed Limits on Rural Interstate Highways
Author: Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 89
Book Description
"To compare the safety effects of a uniform speed limit (USL) for all vehicles as opposed to a differential speed limit (DSL) for cars and heavy trucks, detailed crash data, speed monitoring data, and traffic volumes were sought for rural interstate highways in 17 States for the period 1991 to 2000. Conventional statistical tests (analysis of variance, Tukey's test, and Dunnett's test) were used to study speed and crash rate changes in the four policy groups. A modified empirical Bayes formation was used to evaluate crash frequency changes without presuming a constant relationship between crashes and traffic volume"--Technical report documentation page.
The Safety Impacts of Differential Speed Limits on Rural Interstate Highways
Author: Oversight of Motor Carrier Safety Efforts
Author: United States. Congress. Senate. Committee on Commerce, Science, and Transportation. Subcommittee on Surface Transportation and Merchant Marine Infrastructure, Safety, and SecurityPublisher:
ISBN:
Category : Business & Economics
Languages : en
Pages : 152
Book Description
Technical Assistance Report 17-01-TA-SS
Author: Haggai DavisPublisher:
ISBN:
Category : TRANSPORTATION
Languages : en
Pages : 0
Book Description
"The National Highway Traffic Safety Administration (NHTSA) reported that 37,461 people died in 2016 on US roads, marking the second year in a row that the number has increased [1]. Many transportation-related agencies have adopted a “Vision Zero” or “Towards Zero Deaths” campaign aiming to eliminate the need for that statistic. Speed can often play a role in fatalities, so setting the proper speed limit for roadways is important in saving lives. American speed limits have a complicated history over the past 50 years, which hinders researchers’ ability to look at much longer stretches of data and draw conclusions about determining the best speed limit strategy. From 1973 to 1987, the maximum speed limit was 55 MPH. After that, Congress raised the allowable limit to 65 MPH. It was not until 1995 that states had full discretion over setting an appropriate limit. Some states raised the speed limit for all vehicles equally – a uniform speed limit (USL). Others raised speeds for trucks less than that of cars – a differential speed limit (DSL). On the surface, the benefit of a DSL seems intuitive, lowering the speeds for big trucks would reduce the severity of accidents. However, it also has the effect of increasing total variance in speed which increases the number of accidents. This report aims to explore the literature published about these issues and to inform decision makers about the factors to be weighed when considering DSL versus USL. It was prepared in response to a request in the 2017 session of the Louisiana House of Representatives where the Louisiana Department of Transportation and Development (DOTD) was asked to “study the safety and operational impacts of differential speed limits on interstate highways” (House Concurrent Resolution 112). Thus, the purpose of this study is to inform the Louisiana Legislature about the documented benefits and costs of a differential speed limit for passenger cars versus larger vehicles specifically with regards to the topics of Safety, Mobility and Operations, Fuel Consumption and Emissions, and Truck Determination as outlined in HCR 112."--Introduction.
An Economic Evaluation of Differential Speed Limits on Interstate Highways
Author: David Gail MonganVariable Speed Limit System Cost Benefit Analysis
Author: Publisher:
ISBN:
Category : Highway communications
Languages : en
Pages : 44
Book Description
The variable speed limit (VSL) system is designed to display both the maximum and minimum speed boundaries based on measured traffic and environmental conditions. In addition, short driver information messages can be displayed to warn of downstream conditions. The VSL can be installed to operate independently (Isolated), in a series of stations (Linked), as a component of a larger management system (Integrated), and in the future as part of an "In-Vehicle" component to provide all types of driver information (In-Vehicle). This analysis compares the four types of VSL systems to the existing "fixed" speed limit system which can display only one speed for all conditions
Determining the Safety Effects of Differential Speed Limits on Rural Interstate Highways Using Empirical Bayes Method
Author: Xin SunRural Truck Speed Differentials
Author: Publisher:
ISBN: 9780642512512
Category : Rural roads
Languages : en
Pages : 209
Book Description
This study aimed to examine the effect of the increase in the heavy vehicle speed limit from 80 to 90 km/h on 1 January 1987. Articulated vehicle mean free speeds were found to have increased in four States; car speeds remained stable. The speed differential between cars and articulated vehicles was reduced from 10 to 8 km/h. Rural areas. Heavy vehicles. Trucks. Road safety. Articulated trucks. Road accidents.
Author: