Seizure-Related Motor Vehicle Crashes in Arizona Before and After Reducing the Driving Restriction From 12 to 3 Months

2003 ◽  
Vol 78 (7) ◽  
pp. 819-825 ◽  
Author(s):  
Joseph F. Drazkowski ◽  
Robert S. Fisher ◽  
Joseph I. Sirven ◽  
Bart M. Demaerschalk ◽  
Lori Uber-Zak ◽  
...  
Keyword(s):  
Motor Vehicle ◽  
Motor Vehicle Crashes ◽  
Vehicle Crashes ◽  
Before And After

Evaluation of Speed Camera Enforcement in the District of Columbia

2003 ◽  
Vol 1830 (1) ◽  
pp. 34-37 ◽  
Author(s):  
Richard A. Retting ◽  
Charles M. Farmer
Keyword(s):  
Motor Vehicle ◽  
District Of Columbia ◽  
Motor Vehicle Crashes ◽  
Speed Limit ◽  
Vehicle Crashes ◽  
Targeted Enforcement ◽  
Before And After ◽  
Study Sites

Washington, D.C., implemented a speed camera enforcement program in 2001. Vehicle speeds were measured before and after the program. Seven sites in Washington were selected randomly from a total of 60 targeted enforcement zones. Speed data were collected 1 year before enforcement and approximately 6 months after enforcement began. Results indicated that mean traffic speeds and the proportion of drivers traveling more than 10 mph above the speed limit—fast enough to warrant a speeding ticket—were reduced at each of the Washington study sites. At eight comparison sites in nearby Baltimore, Maryland, where speed camera enforcement was not in place, no decline in traffic speeds was observed. Overall, mean speeds at Washington sites declined by a statistically significant 14% compared with Baltimore sites, and the proportion of vehicles exceeding the speed limit by more than 10 mph declined 82%. These findings indicate that speed camera enforcement reduced speeding on surface streets throughout Washington. On the basis of prior research, such speed reductions can be expected to reduce the frequency and severity of motor vehicle crashes.

Evaluation of Lane Reduction “Road Diet” Measures on Crashes and Injuries

2002 ◽  
Vol 1784 (1) ◽  
pp. 80-90 ◽  
Author(s):  
Herman F. Huang ◽  
J. Richard Stewart ◽  
Charles V. Zegeer
Keyword(s):  
Negative Binomial ◽  
Motor Vehicle ◽  
Motor Vehicle Crashes ◽  
Separate Analysis ◽  
Vehicle Crashes ◽  
Significant Treatment ◽  
Crash Data ◽  
Before And After ◽  
Vehicle Capacity ◽  
Matched Comparison

“Road diets” are often conversions of four-lane undivided roads into three lanes (two through lanes plus a center turn lane). The fourth lane may be converted to bicycle lanes, sidewalks, or on-street parking. Road diets are sometimes implemented with the objective of reducing vehicle speeds as well as the number of motor vehicle crashes and injuries. A study was conducted to investigate the actual effects of road diets on motor vehicle crashes and injuries. Twelve road diets and 25 comparison sites in California and Washington cities were analyzed. Crash data were obtained for these road diet (2,068 crashes) and comparison sites (8,556 crashes). A “before” and “after” analysis using a “yoked comparison” study design found that the percent of road diet crashes occurring during the “after” period was about 6% lower than that of the matched comparison sites. However, a separate analysis in which a negative binomial model was used to control for possible differential changes in average daily traffic, study period, and other factors indicated no significant treatment effect. Crash severity was virtually the same at road diets and comparison sites. There were some differences in crash type distributions between road diets and comparison sites, but not between the “before” and “after” periods. Conversion to a road diet should be made on a case-by-case basis in which traffic flow, vehicle capacity, and safety are all considered. It is also recommended that the effects of road diets be further evaluated under a variety of traffic and roadway conditions.

Motor Vehicle Crashes Involving a Bicycle Before and After Introduction of a Bike Share Program in Philadelphia, Pennsylvania, 2010–2018

2020 ◽  
Vol 110 (6) ◽  
pp. 863-867
Author(s):  
Ghassan B. Hamra ◽  
Leah H. Schinasi ◽  
D. Alex Quistberg
Keyword(s):  
Motor Vehicle ◽  
Interrupted Time Series ◽  
Motor Vehicle Crashes ◽  
Vehicle Crashes ◽  
Interrupted Time Series Analysis ◽  
The Road ◽  
Before And After ◽  
On The Road ◽  
The Impact ◽  
Bike Share

Objectives. To quantify the impact of a citywide bicycle share program on rates of motor vehicle collisions involving a bicycle. Methods. We conducted an interrupted time series analysis, using crash records from the Pennsylvania Department of Transportation for Philadelphia County from 2010 through 2018. We also calculated summary statistics to illustrate annual and monthly trends in rates of motor vehicle crashes involving a bicycle. Results. The baseline rate of bike events was 106% greater (95% confidence interval [CI] = 1.25, 3.38) at the time bicycle share was implemented compared with January 2010. Before bicycle share implementation, the rate of bicycle events decreased 1% (95% CI = 0.95, 1.03) annually. After the bicycle share program started, the rate of bicycle events decreased 13% (95% CI = 0.82, 0.94) annually. Conclusions. In the long term, programs that increase the number of bicycles on the road, such as bike share, may reduce rates of motor vehicle crashes involving a bicycle.

scholarly journals Trends in fatal motor vehicle crashes before and after marijuana commercialization in Colorado

2014 ◽  
Vol 140 ◽  
pp. 137-144 ◽  
Author(s):  
Stacy Salomonsen-Sautel ◽  
Sung-Joon Min ◽  
Joseph T. Sakai ◽  
Christian Thurstone ◽  
Christian Hopfer
Keyword(s):  
Motor Vehicle ◽  
Motor Vehicle Crashes ◽  
Vehicle Crashes ◽  
Before And After

Corrigendum to “Trends in fatal motor vehicle crashes before and after marijuana commercialization in Colorado” [Drug Alcohol Depend. 140 (2014) 137–144]

2014 ◽  
Vol 142 ◽  
pp. 360 ◽  
Author(s):  
Stacy Salomonsen-Sautel ◽  
Sung-Joon Min ◽  
Joseph T. Sakai ◽  
Christian Thurstone ◽  
Christian Hopfer
Keyword(s):  
Motor Vehicle ◽  
Motor Vehicle Crashes ◽  
Vehicle Crashes ◽  
Before And After

31 Use of protective devices among motor vehicle crashes

2015 ◽  
Vol 21 (Suppl 2) ◽  
pp. A11.2-A11
Author(s):  
Ayman El-Menyar ◽  
Hassan Al-Thani ◽  
Rafael Consunji ◽  
Ruben Peralta ◽  
Mohammad Asim ◽  
...  
Keyword(s):  
Motor Vehicle ◽  
Motor Vehicle Crashes ◽  
Vehicle Crashes ◽  
Protective Devices
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