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Technical Report Documentation Page

1. Report No.


2. Government Accession No.

3. Recipient's Catalog No.

4. Title and Subtitle

Regional Assessment of Weather Impacts on Freight

5. Report Date

February 2016

6. Performing Organization Code

7. Author(s)

Daniel Krechmer, Noel Perry, Sarahjoy Gallaher, Marjorie McGuirk, Thomas Burnett, Katherine Blizzard

8. Performing Organization Report No.

9. Performing Organization Name and Address

Cambridge Systematics, Inc.
4800 Hampden Ln Suite 800
Bethesda, MD 20814


CASE Consultants International
Asheville, NC 28805

Noel Perry
Transport Fundamentals, LLC
Lebanon, PA 17042

10. Work Unit No. (TRAIS)

11. Contract or Grant No.

DTFH61-12-D-00048 T-13005

12. Sponsoring Agency Name and Address

U.S. Department of Transportation
Federal Highway Administration
Office of Operations
1200 New Jersey Avenue, SE
Washington, DC 20590

13. Type of Report and Period Covered

September 2014-February 2016

14. Sponsoring Agency Code


15. Supplementary Notes

Government Task Manager: Jimmy Chu

16. Abstract

This project follows up on a study completed for the Federal Highway Administration (FHWA) in 2012 that provided a national estimate of weather-related delay affecting the trucking industry. The initial estimate indicated that weather-related delay costs the industry $8 billion to $9 billion annually. The goal of this study is to conduct a more detailed assessment of the impacts of adverse weather on freight movement in 13 diverse geographic regions, including both urban and rural corridors. The analysis presented in this report indicates that, overall, weather events have a significant negative impact on traffic speeds—and, therefore, the freight industry—when analyzed at the regional level. In this report's study area, which focuses solely on a limited set of major highways, decreased traffic speeds due to weather events are estimated to cost the freight industry $3.8 million per year. The study found that ice, snow, fog, heavy rain, wind, and extreme temperature events were the most correlated with reduced traffic speeds, with the largest decreases occurring during the first hour of storms. Adverse weather was shown to have a greater correlation with decreased traffic speeds during peak hours.

17. Key Words

Freight Economics, Trucking, Weather, Travel Delays

18. Distribution Statement

No restrictions

19. Security Classif. (of this report)


20. Security Classif. (of this page)


21. No. of Pages


22. Price


Form DOT F 1700.7 (8-72) Reproduction of completed pages authorized

SI* (Modern Metric) Conversion Factors

Approximate Conversions to SI Units
Symbol When You Know Multiply By To Find Symbol
in inches 25.4 millimeters mm
ft feet 0.305 meters m
yd yards 0.914 meters m
mi miles 1.61 kilometers km
in2 square inches 645.2 square millimeters mm2
ft2 square feet 0.093 square meters m2
yd2 square yard 0.836 square meters m2
ac acres 0.405 hectares ha
mi2 square miles 2.59 square kilometers km2
fl oz fluid ounces 29.57 milliliters mL
gal gallons 3.785 liters L
ft3 cubic feet 0.028 cubic meters m3
yd3 cubic yards 0.765 cubic meters m3
NOTE: volumes greater than 1000 L shall be shown in m3
oz ounces 28.35 grams g
lb pounds 0.454 kilograms kg
T short tons (2000 lb) 0.907 megagrams (or "metric ton") Mg (or "t")
Temperature (exact degrees)
°F Fahrenheit 5 (F-32)/9 or (F-32)/1.8 Celsius °C
fc foot-candles 10.76 lux lx
fl foot-Lamberts 3.426 candela/m2 cd/m2
Force and Pressure or Stress
lbf poundforce 4.45 newtons N
lbf/in2 poundforce per square inch 6.89 kilopascals kPa
Approximate Conversions from SI Units
Symbol When You Know Multiply By To Find Symbol
mm millimeters 0.039 inches in
m meters 3.28 feet ft
m meters 1.09 yards yd
km kilometers 0.621 miles mi
mm2 square millimeters 0.0016 square inches in2
m2 square meters 10.764 square feet ft2
m2 square meters 1.195 square yards yd2
ha hectares 2.47 acres ac
km2 square kilometers 0.386 square miles mi2
mL milliliters 0.034 fluid ounces fl oz
L liters 0.264 gallons gal
m3 cubic meters 35.314 cubic feet ft3
m3 cubic meters 1.307 cubic yards yd3
g grams 0.035 ounces oz
kg kilograms 2.202 pounds lb
Mg (or "t") megagrams (or "metric ton") 1.103 short tons (2000 lb) T
Temperature (exact degrees)
°C Celsius 1.8C+32 Fahrenheit °F
lx lux 0.0929 foot-candles fc
cd/m2 candela/m2 0.2919 foot-Lamberts fl
Force and Pressure or Stress
N newtons 02.225 poundforce lbf
kPa kilopascals 0.145 poundforce per square inch lbf/in2
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