USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Figure 1 Estimating Average Effective Speed

Thursday, December 1, 2011

Figure 1 Estimating Average Effective Speed

Figure 1 Estimating Average Effective Speed. If you are a user with disability and cannot view this image, please call 800-853-1351 or email answers@bts.gov for assistance.

Key:
VCURVE = the maximum allowable speed on a curve
VROUGH = the maximum allowable ride-severity speed
VSPLIM = the maximum speed resulting from the speed limit
FFS = free flow speed
FFSUP = free-flow speed on an uphill
D = delay
AES = average effective speed