Not necessarily. In many states, you can drive in whichever lane you wish, just as long as you
stay in that lane and not switch around. That way, the traffic can stay in the right lane and just cruise on by you.
Of course, this is not appropriate on 2-lane roads.
ok here is the list
StateKeep Right?LawComments Alabama slower
32-5A-80(b)
Alaska <SL
13 AAC 002.50(b)Keep right if below speed limit. Arizona slower
28-721(B)
Arkansas no27-51-301(b) Law prohibits obstructing traffic by driving continuously in the left lane. California slower
VC 21654(a)"Notwithstanding the prima facie speed limits" Colorado slower* 42-4-1001(2), 42-4-1103(3),
42-4-1013 The left lane is reserved for passing when the speed limit is 65 or higher.
State Patrol brochure discussing law Connecticut slower
14-230(b)Passing on right on Interstate prohibited when only two lanes,
14-233(4) Delaware slower
21-4114(b)
D.C. slower
18-2201.2
Florida slower
316.081(2)Governor Bush vetoed 2005
SB732, which would have reserved the left lane for passing, saying that drivers blocking the left lane are "cautious and careful." Georgia slower*
40-6-40(b),
40-6-184(a)(2) If below speed limit in left lane and blocking overtaking traffic, must move right. Hawaii slower
291C-41(b)Honolulu prohibits driving more than 5 MPH under the limit in the left lane. Idaho slower
49-630(2)
Illinois yes
625 ILCS 5/11-701(b),(d)Keep right except to pass on limited access highways effective January 1, 2004. Indiana slower
9-21-8-2(b)
Iowa slower321.297(2)
Kansas yes8-1522(c), 8-1514(b)Keep right law effective July 1, 2009 (
bill 154 of 2009 session) Kentucky yes
189.340(7)Only where the speed limit is 65 or 70 Louisiana yes
R.S. 32:71On multilane highways keep right except to pass and move right if blocking overtaking traffic. Maine yes
29A-2052(6)Only where the speed limit is 65 Maryland <SL
21-301 If driving 10 MPH under speed limit, or slower than speed of traffic if conditions require speed below limit.
SB 701 would require vehicles in the left lane to give way to faster traffic. Massachusetts yes
89-4BPassing on right prohibited on undivided two-way road,
89-2 Michigan weird
257.634Except in heavy traffic or on freeways with three or more lanes. Minnesota slower
169.18(10)
Mississippi slower
63-3-603(d)
Missouri slower
304.015(3) 304.151 prohibits "obstruct[ing] the regular flow of traffic on...any state highway" Montana slower61-8-321(2)
Nebraska slower
60-6,131(2)
Nevada slow
484.373Move right if "imped[ing] ... movement of traffic" New Hampshire slower
265:16
New Jersey yes39:4-88Passing on right prohibited unless vehicles are in "substantially continuous lines". 39:4-85. New Mexico slower66-7-308(B)
New York slowerV&TL 1120(No link -- New York hides its laws from people using text browsers.) North Carolina <SL
20-146(b),(e)Keep right if below speed limit. North Dakota slower
Ohio <SL
4511.25Ohio used to follow the UVC. In 2006 bicyclists lobbied for and won the right to obstruct traffic by going the speed limit. Left lane for passing only on Turnpike, regulation
5537-2-09. Oklahoma yes
47-11-301,
47-11-309Keep right except to pass on four lanes in effect late 2009. Oregon slower
811.315
Pennsylvania usually75-3313(d), 75-3301(b) May also use left lane to allow traffic to merge or "when traveling at a speed greater than the traffic flow". Puerto Rico <SL
Title 9 §5123
Rhode Island slower
31-15-2No passing on right on two-way street,
31-15-5 South Carolina slower
56-5-1810(b)
South Dakota no
32-26-1"Slow moving vehicles" keep right Tennessee slower55-8-115(b)
Texas slower
545.051(b)DOT may post "left lane for passing only",
544.011. Passing on right prohibited except on one-way roadways,
545.057. Utah slower*
41-6a-701(3),
41-6a-704Must move right to let faster traffic pass. Vermont slower23-1031(b)
Virginia slower*
46.2-804(1)46.2-842.1 requires vehicles in the left lane to yield to faster traffic;
State Police say this applies even when faster traffic is speeding. Washington usually
46.61.100(2)May also use left lane to allow traffic to merge or "when traveling at a speed greater than the traffic flow". West Virginia slower
17C-7-1(b)
Wisconsin slower346.05(3)
Wyoming slower
31-5-201(b)Law excepts "one-way streets". Effective July 1, 2005, it is illegal to block traffic moving within the speed limit by driving in the left lane for a long time. The Uniform Vehicle Code states:
Upon all roadways any vehicle proceeding at less than the normal speed of traffic at the time and place and under the conditions then existing shall be driven in the right-hand lane then available for traffic ...
Note that this law refers to the "normal" speed of traffic, not the "legal" speed of traffic. The 60 MPH driver in a 55 MPH zone where everybody else is going 65 MPH must move right. Contrast Alaska's rule, 13 AAC 002.50, allowing vehicles driving at the speed limit to use the left lane, and Colorado rev. stat. 42-4-1103, prohibiting blocking the "normal and reasonable" movement of traffic.
(Enforcement for failing to keep right while at or above the speed limit is variable. Toledo police have ticketed truck drivers for driving at the 60 MPH speed limit in the left lane. Police looking for criminal activity are aware of the "keep right" law and will use it as an excuse to stop a suspicious car. On the other hand, a New York judge announced that he would not convict drivers for blocking speeding traffic, People v. Ilieveski, 175 Misc. 2d 943; 670 N.Y.S.2d 1004 (Monroe County N.Y. 1998), and most police find speeding easier and more profitable to enforce.)
it didnt paste in correctly but here is the link
http://www.mit.edu/~jfc/right.html
tom