ITE Journal - April 2020 - 48

may never make up 100 percent of the vehicle fleet.22, 23 Given
that the safety and predictability of HAVs will be uncertain in
a mixed-fleet context-and over an extended period-cities,
policymakers, and vehicle companies need to work together
to implement both technology and street design strategies in
order to mitigate safety risks for all road users during this long
transition period. Where possible, cities should seek to maintain
flexibility in street design so that iterative adaptations are
possible, and expensive overhauls are avoided.

Conclusion
Though questions remain regarding how HAVs might transform
our cities and influence roadway safety, this article highlights
how transportation engineers and planners can design roadways
taking "evergreen" safety principles into account, including
knowledge of physics and reaction times needed by people
and machines-both today and in the future. Given the recent
trends in traffic-related pedestrian deaths and speeding-related collisions, it is even more important to implement both
technology and street design strategies to moderate vehicle
speeds and shorten reaction times for both human drivers and
HAVs. Vehicle companies, policymakers, and transportation
engineers and planners will need work together to build a transportation system that is safe and legible with the introduction of
HAVs-especially, during the long transition period where there
are mixed fleets on the road. itej

References
1.	 SAE. SAE International Releases Updated Visual Chart for Its "Levels of Driving
Automation" Standard for Self-Driving Vehicles. 2018. https://www.sae.org/
news/press-room/2018/12/sae-international-releases-updated-visualchart-for-its-%E2%80%9Clevels-of-driving-automation%E2%80%9Dstandard-for-self-driving-vehicles (Accessed March 3, 2020).
2.	 NHTSA. Traffic Deaths Decreased in 2018, but Still 36,560 People Died. 2018.
Retrieved from https://www.nhtsa.gov/traffic-deaths-2018 (Accessed
March 3, 2020).
3.	 NHTSA (2016). Fatality Analysis Reporting System (FARS). https://www.
nhtsa.gov/research-data/fatality-analysis-reporting-system-fars
(Accessed March 3, 2020).
4.	 Vision Zero Network (2018). What is Vision Zero? https://visionzeronetwork.
org/about/what-is-vision-zero (Accessed March 3, 2020).
5.	 ITE. Core Elements for Vision Zero Communities. 2018. https://www.ite.
org/pub/?id=F56B1D96-EFFB-B97B-153B-F217E1B69DD8 (Accessed
March 3, 2020).
6.	 ITE. Safe Systems. 2018. https://www.ite.org/technical-resources/topics/
safe-systems (Accessed March 3, 2020).
7.	 ITE. Speed Management for Safety. 2020. https://www.ite.org/
technical-resources/topics/speed-management-for-safety (Accessed
March 3, 2020).
48

Apri l 2020

i te j o urn al

8.	 Elvik, R., Vadeby, A., Hels, T., and Van Schagen, I. "Updated Estimates of
the Relationship between Speed and Road Safety at the Aggregate and
Individual Levels" Accident Analysis and Prevention. Vol. 123, February
2019, pp. 114-122. (Accessed March 3, 2020).
9.	 Lewis, P. & Grossman, A. Beyond Speculation 2.0 - An Update to Eno's
Action Plan for Federal, State, and Local Policymakers. Washington, DC,
April 2019. https://www.enotrans.org/wp-content/uploads/2019/04/41-AV-Paper-FINAL-with-Cover.pdf. (Accessed March 3, 2020).
10.	 Kumfer, W., LaJeunesse, S., Sandt, L., and Thomas, L. "Speed, Kinetic Energy,
and the Safe Systems Approach to Safer Roadways." ITE Journal, Vol 89, No.
4, 32-36, April 2019.
11.	 AASHTO. A Policy on Geometric Design of Highways and Streets. 7th
Edition. Washington, DC, USA: American Association of State Highway
and Transportation Officials, 2018 (Accessed March 3, 2020).
12.	 Texas A&M Transportation Institute. New Study Says Texting Doubles
a Driver's Reaction Time. 2011. https://tti.tamu.edu/news/new-studysays-texting-doubles-a-driver%E2%80%99s-reaction-time (Accessed
March 3, 2020).
13.	 Singh, S. Critical reasons for crashes investigated in the National Motor
Vehicle Crash Causation Survey. February 2015. (Traffic Safety Facts
Crash*Stats. Report No. DOT HS 812 115). Washington, DC: National
Highway Traffic Safety.
14.	 NHTSA. Distracted Driving in Fatal Crashes, 2017. 2019. https://crashstats.
nhtsa.dot.gov/Api/Public/ViewPublication/812115 (Accessed
March 3, 2020).
15.	 CDC. Motor Vehicle Safety. 2019. https://www.cdc.gov/
motorvehiclesafety/impaired_driving/impaired-drv_factsheet.html
(Accessed March 3, 2020).
16.	 Sandt, L. & Owens, J.M. Discussion Guide for Automated and Connected
Vehicles, Pedestrians, and Bicyclists. Pedestrian and Bicycle Information
Center. Chapel Hill, NC, August 2017. http://www.pedbikeinfo.org/cms/
downloads/PBIC_AV_Discussion_Guide.pdf (Accessed March 3, 2020).
17.	 NTSB. Highway Accident Report - Collision Between Vehicle Controlled
by Developmental Automated Driving System and Pedestrian - Tempe,
Arizona - March 18, 2018. 2018. https://www.ntsb.gov/investigations/
AccidentReports/Reports/HAR1903.pdf (Accessed March 3, 2020).
18.	 Lefler, D.E. and Gabler, H.C. The fatality and injury risk of light truck
impacts with pedestrians in the United States. Accident Analysis &
Prevention. Volume 36, Issue 2, 295-304. 2004.
19.	 Chengbo Ai, C., and Tsai, J. "Critical Assessment of an Enhanced
Traffic Sign Detection Method Using Mobile LiDAR and INS
Technologies." ASCE. Retrieved from https://ascelibrary.org/
doi/10.1061/%28ASCE%29TE.1943-5436.0000760 (Accessed
March 3, 2020).
20.	 D'Onfro, Jillian. "'I hate them': Locals reportedly are frustrated with
Alphabet's self-driving cars." CNBC. August 28, 2018. https://www.cnbc.
com/2018/08/28/locals-reportedly-frustrated-with-alphabets-waymoself-driving-cars.html (Accessed March 3, 2020).


https://www.enotrans.org/wp-content/uploads/2019/04/4-1-AV-Paper-FINAL-with-Cover.pdf https://www.enotrans.org/wp-content/uploads/2019/04/4-1-AV-Paper-FINAL-with-Cover.pdf https://tti.tamu.edu/news/new-study-says-texting-doubles-a-driver%E2%80%99s-reaction-time https://tti.tamu.edu/news/new-study-says-texting-doubles-a-driver%E2%80%99s-reaction-time https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/812115 https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/812115 https://www.cdc.gov/motorvehiclesafety/impaired_driving/impaired-drv_factsheet.html https://www.cdc.gov/motorvehiclesafety/impaired_driving/impaired-drv_factsheet.html https://www.sae.org/news/press-room/2018/12/sae-international-releases-updated-visual-chart-for-its-%E2%80%9Clevels-of-driving-automation%E2%80%9D-standard-for-self-driving-vehicles http://www.pedbikeinfo.org/cms/downloads/PBIC_AV_Discussion_Guide.pdf https://www.sae.org/news/press-room/2018/12/sae-international-releases-updated-visual-chart-for-its-%E2%80%9Clevels-of-driving-automation%E2%80%9D-standard-for-self-driving-vehicles http://www.pedbikeinfo.org/cms/downloads/PBIC_AV_Discussion_Guide.pdf https://www.sae.org/news/press-room/2018/12/sae-international-releases-updated-visual-chart-for-its-%E2%80%9Clevels-of-driving-automation%E2%80%9D-standard-for-self-driving-vehicles https://www.sae.org/news/press-room/2018/12/sae-international-releases-updated-visual-chart-for-its-%E2%80%9Clevels-of-driving-automation%E2%80%9D-standard-for-self-driving-vehicles https://www.ntsb.gov/investigations/AccidentReports/Reports/HAR1903.pdf https://www.nhtsa.gov/traffic-deaths-2018 https://www.ntsb.gov/investigations/AccidentReports/Reports/HAR1903.pdf https://www.nhtsa.gov/research-data/fatality-analysis-reporting-system-fars https://www.nhtsa.gov/research-data/fatality-analysis-reporting-system-fars https://www.visionzeronetwork.org/about/what-is-vision-zero https://www.visionzeronetwork.org/about/what-is-vision-zero https://www.ascelibrary.org/doi/10.1061/%28ASCE%29TE.1943-5436.0000760 https://www.ite.org/pub/?id=F56B1D96-EFFB-B97B-153B-F217E1B69DD8 https://www.ascelibrary.org/doi/10.1061/%28ASCE%29TE.1943-5436.0000760 https://www.ite.org/pub/?id=F56B1D96-EFFB-B97B-153B-F217E1B69DD8 https://www.ite.org/technical-resources/topics/safe-systems https://www.cnbc.com/2018/08/28/locals-reportedly-frustrated-with-alphabets-waymo-self-driving-cars.html https://www.ite.org/technical-resources/topics/safe-systems https://www.cnbc.com/2018/08/28/locals-reportedly-frustrated-with-alphabets-waymo-self-driving-cars.html https://www.ite.org/technical-resources/topics/speed-management-for-safety https://www.cnbc.com/2018/08/28/locals-reportedly-frustrated-with-alphabets-waymo-self-driving-cars.html https://www.ite.org/technical-resources/topics/speed-management-for-safety

ITE Journal - April 2020

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