PaperImpact of the 65 mph speed limit on accidents, deaths, and injuries in illinois
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Cited by (62)
Assessing the safety effectiveness of citywide speed limit reduction: A causal inference approach integrating propensity score matching and spatial difference-in-differences
2022, Transportation Research Part A: Policy and PracticeCitation Excerpt :Early studies (Baum et al., 1989; Baum et al., 1990; Brown et al., 1990; Cetin et al., 2018; Engel, 1990; Engel and Thomsen, 1992; Farmer et al., 1999; Finch et al., 1994; Finch, 1994; Isaksson-Hellman and Töreki, 2019; Nilsson, 1990; Patterson et al., 2002; Persaud et al., 2010; Scharping, 1994; Webster and Layfield, 2003; Wood and Donnell, 2017) compared raw crash frequencies before and after speed limit changes without controlling for critical safety factors, which would result in biased estimates of the safety effectiveness. In addition, regression models such as time series models (Chang et al., 1993; Farmer et al., 1999; Gallaher et al., 1989; Garber and Graham, 1990; Grundy et al., 2009; Johansson, 1996; Ledolter and Chan, 1996; McKnight and Klein, 1990; Rock, 1995; Vernon et al., 2004; Wagenaar et al., 1990), cross-section regressions (Malyshkina and Mannering, 2008) and panel data models (Michener and Tighe, 1992; Ossiander and Cummings, 2002; Patterson et al., 2002) were also applied to estimate the safety effectiveness of speed limit changes by setting speed limit changes or speed limit as an independent variable after controlling for safety factors. Although the regression models can better capture the safety effectiveness of speed limit changes by controlling for safety factors, they are still subject to two critical issues: 1) time trend caused by unobserved factors, and 2) spatial spillover effect of treatment.
Effect of increasing the freeway posted speed limit on entry ramp speed-change lane crash frequency
2021, Transportation EngineeringCitation Excerpt :In particular, the crash frequency increased after increasing the freeway posted speed limit at entry ramp speed-changes lanes with a lower crash frequency during the before-period. As was observed by researchers in the past, increasing the posted speed limit on interstates could increase the number of severe crashes [12–18], decrease the number of crashes [19,20] or do not have a noticeable effect on the number of crashes [21,22]. The findings from this research reiterate that there could be a positive influence, negative influence or no change in crash frequency after increasing the freeway posted speed limit on I-485.
The complex relationship between increases to speed limits and traffic fatalities: Evidence from a meta-analysis
2019, Safety ScienceCitation Excerpt :The second effect is the “speed spillover effect” (Brown et al., 1990; Garber and Graham, 1990), according to which drivers get used to driving at higher speeds, even on roads where the maximum speed limit has not changed. This “speed adaption or generalization” effect (Rock, 1995) would therefore lead to a decline in road safety on roads not affected by the increase to the speed limit. As far as the findings of these studies are concerned, major discrepancies can be observed in the estimations obtained by the wide range of studies on the topic, irrespective of the geographic areas and roads under study.
Time series modeling in traffic safety research
2018, Accident Analysis and PreventionCitation Excerpt :Other studies have considered changes in hospital admissions following a mandatory safety belt law (Wagenaar and Margolis, 1990). ARIMA methods have also been used for studies on speed limit changes (Rock, 1995; Vernon et al., 2004), pedestrian stop vs. yield policies at crosswalks and intersections (Kweon et al., 2009), the implementation of photo enforcement at intersections (Carnis and Blais, 2013; Vanlaar et al., 2014), and enhanced driver licensing policies (Neyens et al., 2008). Like single-equation autoregressive methods, simultaneous equation models, such as VAR, are increasingly being used as computational power becomes less of an issue.
Estimating the safety impacts in before–after studies using the Naïve Adjustment Method
2017, Transportmetrica A: Transport Science