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Road Weather Information for Travelers
Foreword
Notice
This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. This report does not constitute a standard, specification, or regulation.
The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names may appear in this report only because they are considered essential to the objective of the document.
Quality Assurance Statement
The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.
Technical Report Documentation Page
1. Report No.
FHWA-JPO-11-001 |
2. Government Accession No. |
3. Recipient’s Catalog No. |
4. Title and Subtitle
Road Weather Information for Travelers
Improving Road Weather Messages and Dissemination Methods
|
5. Report Date
February 2010 |
6. Performing Organization Code |
7. Author(s)
Roemer Alfelor |
8. Performing Organization Report No. |
9. Performing Organization Name and Address
Cambridge Systematics, Inc.
100 CambridgePark Drive, Suite 400
Cambridge, MA 02140
|
10. Work Unit No. |
11. Contract or Grant No.
DTFH61-06-D-0004 |
12. Sponsoring Agency Name and Address
Department of Transportation
Federal Highway Administration
Road Weather Management Program
1200 New Jersey Avenue, SW, E-86-205
Washington, DC 20590
|
13. Type of Report and Period Covered
Flyer
November 2010
|
14. Sponsoring Agency Code
|
15. Supplementary Notes
FHWA COTR: Paul Pisano, Road Weather Management, Ben McKeever, JPO |
16. Abstract
This flyer provides information on a recently completed study, “Human Factors Analysis of Road Weather Advisory and Control Information” (Publication No. FHWA-JPO-10-053) that evaluated the current state of practice in communicating weather-related traffic advisory and control information to the public, and to recommend ways to improve it. The research came up with a series of guidelines to meet the needs of drivers and travelers under various weather conditions and travel scenarios. |
17. Key Words
Road weather management, messages, DMS, travel advisories |
18. Distribution Statement
No restrictions. This document is available to the public through the National Technical Information Service, Springfield, VA 22161. |
19. Security Classif. (of this report)
Unclassified |
20. Security Classif. (of this page)
Unclassified |
21. No of Pages
2 |
22. Price
N/A |
Form DOT F 1700.7 (8-72) Reproduction of completed pages authorized
Metric Conversion Factors
(International System of Units)
| APPROXIMATE CONVERSIONS TO SI
UNITS |
| SYMBOL |
WHEN YOU KNOW |
MULTIPLY BY |
TO FIND |
SYMBOL |
| LENGTH |
| in |
inches |
25.4 |
millimeters |
mm |
| ft |
feet |
0.305 |
meters |
m |
| yd |
yards |
0.914 |
meters |
m |
| mi |
miles |
1.61 |
kilometers |
km |
| AREA |
| 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 |
| VOLUME |
| 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 |
| MASS |
| 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) |
| oF |
Fahrenheit |
5 (F-32)/9
or (F-32)/1.8 |
Celsius |
oC |
| ILLUMINATION |
| 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 |
| LENGTH |
| mm |
millimeters |
0.039 |
inches |
in |
| m |
meters |
3.28 |
feet |
ft |
| m |
meters |
1.09 |
yards |
yd |
| km |
kilometers |
0.621 |
miles |
mi |
| AREA |
| 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 |
| VOLUME |
| 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 |
| MASS |
| 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) |
| oC |
Celsius |
1.8C+32 |
Fahrenheit |
oF |
| ILLUMINATION |
| lx |
lux |
0.0929 |
foot-candles |
fc |
| cd/m2 |
candela/m2 |
0.2919 |
foot-Lamberts |
fl |
| FORCE and PRESSURE or STRESS |
| N |
newtons |
0.225 |
poundforce |
lbf |
| kPa |
kilopascals |
0.145 |
poundforce per square inch |
lbf/in2 |
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