Author: David Gail MonganPublisher:
ISBN:
Category :
Languages : en
Pages : 348
Book Description
An Economic Evaluation of Differential Speed Limits on Interstate Highways
Author: David Gail MonganSafety 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.
An Analysis of Speed Limit Policies for Indiana
Author: Nisar KhanPublisher:
ISBN:
Category : Speed limits
Languages : en
Pages : 186
Book Description
The repeal of the National maximum Speed Limit law in 1995 enabled individual states to set their own speed limits. Speed limits are necessary to ensure mobility while preserving highway safety. It is important that states continually monitor and evaluate existing operating speeds in the context of changing patterns of travel, and changing characteristics of highways, vehicles, drivers, and land-use. Any efforts to review existing speed limits should be accompanied by evaluation of policy impacts such as safety and economic productivity. The goal of this research is to develop a set of speed limit policy guidelines for the state. The study reviews the historical trends in traffic speed in Indiana and recommends a detailed analysis of the impact of speed limit changes on safety and the trucking industry in Indiana. The report also presents a state-of-the-art practice review and a set of possible actions that may be considered for speed limits in Indiana.
An Evaluation of the 55 Mph Speed Limit Enforcement Demonstration Projects in Connecticut and Utah
Author: Terry M. KleinInterim Report on the Safety Consequences of Raising the Speed Limit on Rural Interstate Highways
Author: An Economic Evaluation of Traffic Movement at Various Speeds
Author: Jack C. MarcellisPublisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 322
Book Description
Revised Highway Economic Evaluation Model (HEEM-II)
Author: Jeffery Lynn MemmottPublisher:
ISBN:
Category : HEEM-II (Computer program)
Languages : en
Pages : 346
Book Description
Safety Impacts of Different Speed Limits on Cars and Trucks
Author: David L. HarkeyPublisher:
ISBN:
Category : Speed limits
Languages : en
Pages : 78
Book Description
The objectives of this study were to determine whether differential or uniform speed limits are more beneficial to transportation safety and traffic operations on Interstate highways. The approach to achieving this objective was to examine speed and accident data from States employing both types of limits. Speed data were collected in 12 States at rural and urban locations representing all speed limits currently established on the Interstate highway system for cars/trucks, i.e., 55/55 mi/h (89/89 km/h), 65/55 mi/h (105/89 km/h), 65/60 mi/h (105/97 km/h), and 65/65 mi/h (105/105 km/h). Accident data were obtained from nine States which were geographically distributed across the country and representative of all rural Interstate speed limits currently established. For the speed data collected, a number of measures of effectiveness (MOEs) were examined including mean speed, speed variance, compliance, and speed distribution measures. For the accident data collected, types of crashes were examined (e.g., rear-end) along with vehicle type involvement (e.g., car-into-truck) and crash severity. This final report summarizes the effects of uniform and differential speed limits on transportation safety and traffic operations as determined by the examination of speed and accident data.
Evaluating the Impacts of Speed Limit Policy Alternatives
Author: Publisher:
ISBN:
Category : Speed limits
Languages : en
Pages : 146
Book Description
As of June 2014, Michigan is one of eight states with a differential speed limit in place on its rural freeways, which sets a maximum speed of 70 mph for passenger vehicles and 60 mph for trucks and buses. In select urban environments, these speed limits are both reduced to a uniform 55 mph limit. Legislation was introduced in early 2014 that proposed increases to these speed limits. In order to ascertain the potential impacts of these proposed speed limit increases, this research examined a broad range of traffic safety, operational, environmental, and economic data. This study involved a comprehensive state-of-the-art review of prior research on the relationships between traffic speed, safety, and crash risk. A survey was conducted of state agency practices with respect to speed limit establishment and another survey was conducted to obtain feedback on proposed changes from the trucking industry. National fatality data were collected and analyzed to ascertain the effects of speed limit policies on traffic fatalities, with specific emphasis on maximum speed limits and the effects of uniform vs. differential limits on urban and rural interstates. Further analyses were conducted at the disaggregate level to examine crash trends on Michigan freeways. These results were supplemented by the analysis of field speed data that were collected on freeways in Michigan, Indiana, and Ohio. Differences in mean speeds, 85th percentile speeds, and the standard deviation in speeds among passenger cars, trucks, and buses were examined with respect to the speed limit policies in place at each of 160 roadway locations. Based upon the results of the fatality and speed data analyses, a benefit-cost analysis of the proposed speed limit change was conducted in consideration of both road user and agency costs. Recommendations were presented to aid in decision-making related to speed limit policies.
Managing Speed
Author: Publisher: Transportation Research Board
ISBN: 9780309065023
Category : Business & Economics
Languages : en
Pages : 444
Book Description
TRB Special Report 254 - Managing Speed: Review of Current Practices for Setting and Enforcing Speed Limits reviews practices for setting and enforcing speed limits on all types of roads and provides guidance to state and local governments on appropriate methods of setting speed limits and related enforcement strategies. Following an executive summary, the report is presented in six chapters and five appendices.