Arlington Traffic Volumes
A quick-and-dirty comparison of year-to-year traffic volumes for I-66 through Arlington County, derived from annual VDOT traffic volume publications.
Thank the folks at Greater Greater Washington for the reason behind this table.
Eastbound one-way volumes (AADT)
| Location | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 6-yr '01-'07 Change |
| E of Dulles Toll Road | 65,000 | 74,000 | 73,000 | 74,000 | 71,000 | 70,000 | 69,000 | +6% |
| E of Washington St/Route 29 (Exit 69) | 54,000 | 54,000 | 53,000 | 56,000 | 55,000 | 54,000 | 53,000 | -2% |
| N of Sycamore St on-ramp | 61,000 | 61,000 | 64,000 | 61,000 | 60,000 | 59,000 | 59,000 | -3% |
| E of Fairfax Dr/Route 237 | 43,000 | 43,000 | 42,000 | 40,000 | 40,000 | 39,000 | N/A | -9% (2006) |
| E of Glebe Rd on-ramp | 52,000 | 53,000 | 53,000 | 53,000 | 52,000 | 52,000 | 51,000 | -2% |
| E of Lee Hwy (Exit 72) | 46,000 | 45,000 | 47,000 | 46,000 | 45,000 | 44,000 | 44,000 | -4% |
| E of Rosslyn Exit (Exit 73) | 38,000 | 38,000 | 40,000 | 37,000 | 36,000 | 35,000 | 35,000 | -8% |
| E of Lynn St on-ramp | 53,000 | 53,000 | 55,000 | 55,000 | 54,000 | 53,000 | 53,000 | No change |
Westbound one-way volumes (AADT)
| Location | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 6-yr '01-'07 Change |
| W of Route 110 on-ramp | 47,000 | 47,000 | 47,000 | 44,000 | 44,000 | 45,000 | 44,000 | -6% |
| W of Rosslyn/Key Bridge Exit (Exit 73) | 33,000 | 33,000 | 33,000 | 34,000 | 35,000 | 35,000 | 35,000 | +6% |
| W of Rosslyn on-ramp (near 21st St overpass) | 41,000 | 41,000 | 40,000 | 40,000 | 40,000 | 41,000 | 40,000 | -2% |
| W of Lee Hwy on-ramp | 49,000 | 49,000 | 48,000 | 49,000 | 49,000 | 48,000 | 48,000 | -2% |
| W of Glebe Rd (Exit 71) | 43,000 | 43,000 | 43,000 | 41,000 | 41,000 | 41,000 | 37,000 | -14% |
| W of Fairfax Dr on-ramp | 53,000 | 53,000 | 52,000 | 56,000 | 57,000 | 57,000 | 57,000 | +8% |
| W of Washington St on-ramp | 64,000 | 58,000 | 57,000 | 61,000 | 69,000 | 68,000 | 68,000 | +6% |
CAUTION NOTE: Because of the way VDOT publishes their traffic volumes (with some annual changes due to traffic estimates, some annual changes due to actual traffic counts taken, and in the case of some entries, no changes at all), these numbers should be taken with a grain of salt. That said, they do provide an overall picture of the traffic situation on I-66.
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Last updated 24 October, 2008