JTTs  Vol.9 No.1 , January 2019
Safety Evaluation of Stop-Sign Mounted Beacons—A Cross-Sectional Study
ABSTRACT
Agencies in Iowa have utilized both overhead flashing beacons and stop-sign mounted beacons. Although several studies have shown that overhead flashing beacons are effective, some concerns have been raised about driver confusion. The main concern is that a driver may interpret a multiface flashing beacon with a red indication for their approach as an all-way stop control. As a result, the Iowa DOT has been advocating use of stop-sign mounted beacons rather than overhead flashing beacons. Since little information is available about this countermeasure, data for intersections with (treatment) and without (control) stop-sign mounted beacons were identified and a cross-sectional analysis conducted (due to few confirmable installation dates). Rural stop-controlled intersections with stop-sign mounted beacons in Iowa (USA) were identified (40 in total). Intersection characteristics such as number of approaches, intersection angle etc. were extracted. Additionally, characteristics of individual approaches such as roadway surface (gravel/paved), advanced stop-sign rumble strips, and advance signing were recorded. One or more control locations were manually selected for each treatment intersection based on matching roadway configuration, presence of lighting, advance stop line rumble strips, number of approaches, channelization, traffic volume, and proximity. Propensity scores were estimated to match 40 control locations for comparison. Negative binomial models for different injury combinations at nighttime and daytime were developed with an indicator variable for presence and absence of stop-sign mounted beacons. Presence of stop-sign mounted beacons was associated with a 5% - 54% reduction in nighttime crashes. Injury nighttime crashes decreased by 54% and total nighttime crashes reduced by 18%.
Cite this paper
Goswamy, A. , Hallmark, S. , Basulto-Elias, G. and Pawlovich, M. (2019) Safety Evaluation of Stop-Sign Mounted Beacons—A Cross-Sectional Study. Journal of Transportation Technologies, 9, 95-108. doi: 10.4236/jtts.2019.91006.
References
[1]   IIHS. Roadway and Environment. Insurance Institute for Highway Safety, Highway Loss Data Institute.
http://www.iihs.org/iihs/topics/t/roadway-and-environment/fatalityfacts/roadway-and-environment

[2]   Retting, R.A., Weinstein, H.B. and Solomon, M.G. (2003) Analysis of Motor-Vehicle Crashes at Stop Signs in Four U.S. Cities. Journal of Safety Research, 34, 485-489.
https://doi.org/10.1016/j.jsr.2003.05.001

[3]   Massie, D.L., Campbell, K.L. and Blower, D.F. (1993) Development of a Collision Typology for Evaluation of Collision Avoidance Strategies. Accident Analysis & Prevention, 25, 241-257.
https://doi.org/10.1016/0001-4575(93)90019-S

[4]   Donell, E.T., Harwood, D.W., Bauer, K.M., Mason Jr., J.M. and Pietrucha, M.T. (2002) Cross-Median Collisions on Pennsylvania Interstates and Expressways. Transportation Research Record: Journal of the Transportation Research Board, 1784, 91-99.

[5]   Harwood, D.W., Pietrucha, M.T., Wooldridge, M.D., Brydia, R.E. and Fitzpatrick, K. (1995) NCHRP Report 375: Median Intersection Design. TRB, National Research Council, Washington DC.

[6]   Burchett, G.D. and Maze, T.H. (2006) Rural Expressway Intersection Characteristics as Factors in Reducing Safety Performance. Transportation Research Record: Journal of the Transportation Research Board, 1953, 71-80.

[7]   Srinivasan, R. (March 2008) Safety Evaluation of Flashing Beacons at Stop-Controlled Intersections. U.S. Department of Transportation, Federal Highway Administration, FHWA-HRT-08-044.

[8]   Murphy, B.G. and Hummer, J.E. (2007) Development of Crash Reduction Factors for Overhead Flashing Beacons at Rural Intersections in North Carolina. Transportation Research Record: Journal of the Transportation Research Board, 2030, 15-21.

[9]   Pant, P.D., Park, Y., Neti, S.V. and Hossain, A.B. (2007) Comparative Study of Rural Stop-Controlled and Beacon-Controlled Intersections. Transportation Research Record: Journal of the Transportation Research Board, 1692, 164-172.
https://doi.org/10.3141/1692-17

[10]   Hammer, J.B. and Tye, E.J. (1987) Overhead Yell-Red Flashing Beacons. California Department of Transportation and Federal Highway Administration, FHWA/- CA/TE-87/01.

[11]   Cribbins, P. and Walton, C. (1970) Traffic Signals and Overhead Flashers at Rural Intersections: Their Effectiveness in Reducing Accidents. HRB Record 325.

[12]   Brewer, M.A. and Fitzpatrick, K. (2004) Preliminary Evaluations of Safety Treatments on Rural Highways I Texas. Texas Transportation Institute, FHWA/TX- 05/0-4048-5.

[13]   Stackhouse, S. and Cassidy, P. (1996) Warning Flashers at Rural Intersections. Mn/DOT Final Report MN/RC-1998/01. Minnesota Department of Transportation.

[14]   Janoff, M.S. and Hill, J.G. (1986) Effectiveness of Flashing Beacons in Reducing Accidents at a Hazardous Rural Curve. Transportation Research Board, National Research Council, Washington DC.

[15]   Goswamy, A., Hallmark, S., Litteral, T. and Pawlovich, M. (2018) Safety Evaluation of Destination Lighting Treatment at Stop Controlled Cross-Intersections. Transportation Research Record: Journal of the Transportation Research Board, published online.
https://doi.org/10.1177/0361198118774747

[16]   Jackett, M. and Frith, W. (2013) Quantifying The Impact of Road Lighting on Road Safety—A New Zealand Study. IATSS Research, 36, 139-145.
https://doi.org/10.1016/j.iatssr.2012.09.001

[17]   Bhagavathula, R., Gibbons, R. and Edwards, C. (2015) Relationship between Roadway Illuminance Level and Nighttime Rural Intersection Safety. Transportation Research Record: Journal of the Transportation Research Board, 2485, 8-15.
https://doi.org/10.3141/2485-02

[18]   Isebrands, H.N., Hallmark, S.L., Li, W., McDonald, T., Storm, R. and Preston, H. (2010) Roadway Lighting Shows Safety Benefits at Rural Intersections. ASCE Journal of Transportation Engineering, 136, 949-955.

[19]   Donnell, E.T., Porter, R.J. and Shankar, V.N. (2010) A Framework for Estimating the Safety Effects of Roadway Lighting at Intersections. Safety Science, 48, 1436-1444.
https://doi.org/10.1016/j.ssci.2010.06.008

 
 
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