Passing lane - wikipedia Passing lane A car passes a slower moving truck, using a passing lane on the A2 motorway in Slovenia A passing lane ( North American English ) or overtaking lane ( English ) is the lane on a multi-lane highway or motorway closest to the center of the road ( the central reservation ). In some countries, lanes are described as being on the ' inside ' or the ' outside ' of a road - which one the passing lane is varies. In modern traffic planning, passing lanes on freeways are usually designed for through / express traffic, while the lanes furthest from the center of the road have entry / exit ramps. However due to routing constraints, some freeways may have ramps exiting from the passing lane ; these are known as `` left exits '' in North America. A passing lane is commonly referred to as a `` fast lane '' because it is often used for extended periods of time for through traffic or fast traffic. In theory, a passing lane should be used only for passing, thus allowing, even on a road with only two lanes in each direction, motorists to travel at their own pace. Contents 1 Misuse and common practice in the United States 1.1 Signage 1.2 Proper use 1.3 Hammer lane 2 Climbing lane 3 Australian use 4 Cultural references 5 References 6 External links Misuse and common practice in the United states An SUV prepares to pass a slower moving car, using a passing lane in rural Utah Common practice and most law on United States highways is that the left lane is reserved for passing and faster moving traffic, and that traffic using the left lane must yield to traffic wishing to overtake. Evidence exists demonstrating the efficiency of this practice. The United States 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... It is also illegal in many states in the US to use the `` far left '' or passing lane on a major highway as a traveling lane ( as opposed to passing ), or to fail to yield to faster moving traffic that is attempting to overtake in that lane. For example, Colorado 's `` Left Lane Law '' states : A person shall not drive a motor vehicle in the passing lane of a highway if the speed - limit is sixty - five miles per hour or more unless such person is passing other motor - vehicles that are in a non-passing lane... In other states, such as Massachusetts, New Jersey, Maine, Illinois, Pennsylvania, and others, it is illegal to fail to yield to traffic that seeks to overtake in the left lane, or to create any other `` obstruction '' in the passing lane that hinders the flow of traffic. As a result, heavy trucks are often prohibited from using the passing lane. The left lane is commonly referred to as the `` fast lane '', but that is not an accurate description of the lane 's purpose. The left lane is the designated passing lane, however, vehicles in the left lane must obey the posted speed limits. A common problem arising from misuse of the left lane is speeding and tailgating. These actions create road rage and increase overall danger. A driver hoping to pass a slow motorist in the `` fast lane '' can be stuck in an awkward situation. One strategy is to signal a lane change toward the center median. Another is to flash headlights. A third, which is dangerous and illegal, is to drive very close to the `` fast lane '' driver 's bumper ( this is known as tailgating ). Most commonly, motorists will attempt to overtake the outer car on the inner lane either to continue at a fast pace or to pass a car that is going too slowly in the passing lane. On high - capacity multilane freeways ( three or more lanes per direction ), many motorists often pass on the inner lane, largely in response to misuse of the `` passing lane '' by slower traffic. In some areas, such as the US states of Colorado and Kentucky, vehicles in the left lane are required to yield to faster traffic only if the speed limit is above 65 miles per hour. In other areas, like Alaska, there is no law requiring slower traffic to move over for faster traffic. Signage The use of passing lanes for faster traffic is sometimes acknowledged with signs using phrases such as `` Slower Traffic Keep Right '' ( in Canada, where the passing lane is to the left ). In a study by the AASHTO Subcommittee on Traffic Engineering, all 24 US states involved used some form of passing lane courtesy signage, 9 of which only use those signs for steep graded roads. Proper use Many areas which make it illegal to fail to yield to faster traffic also have exceptions to those rules. Some of these exceptions include preparing to make a left turn, taking an exit located on the left side of the roadway, avoiding traffic merging onto the roadway, or overtaking and passing another vehicle. In Quebec, it is also illegal to travel in the left lane when not passing when the speed limit is over 80 km / h ( 50 mph ). Truckers often use the passing lane in moderate traffic where legal to do so to reduce travel times, however in many areas, tractor trailers are banned from using the passing lane for safety reasons ; these restrictions are normally found along urban, often congested highways with multiple lanes ( e.g. Interstate 40 west of Raleigh, North Carolina ), or on rural freeways with 6 or more lanes ( 3 in each direction ). Hammer lane The hammer lane is another term for the passing lane. Its etymology originated with truckers in North America in reference to slamming the accelerator with a foot like hammer. ) HOV lanes are not usually considered hammer lanes, but are also used for express travel by commuters. Climbing lane Main article : Climbing lane In hilly terrain, some undivided highways are built with three lanes, with the extra added pavement known as the `` climbing lane '' or `` crawler lane ''. Two lanes are used for traffic heading in the uphill direction, with one lane being a passing or climbing lane, and one lane is used for downhill traffic. On dual carriageways, the climbing lane may be marked with a broken double white line. Australian use In Australia, most intercity highways are constructed with only one lane in each direction. Head - on collisions are a risk, particularly with fatigued drivers. Overtaking lanes are an additional lane in one direction for a short distance ( one or two kilometres ) to assist faster traffic to safely overtake slower traffic. Road markings are often painted so that the additional lane appears in the centre of the road ( guiding traffic to the left ), and traffic needs to deliberately change lanes to overtake. At the end, the markings are the other way, so that the left lane must yield and merge into the overtaking lane. Large signs alert drivers that they are approaching an overtaking lane, often at 5km and 1km distances before the lane starts. Cultural references Fast Lane, an arcade game Life in the Fast Lane, a song by the Eagles Jones in the Fast Lane, 1990 MS - DOS based game References Jump up ^ ( 1 ) Archived September 29, 2007, at the Wayback Machine. Jump up ^ `` General Laws ''. malegislature.gov. Jump up ^ New Jersey Permanent Statutes Database Jump up ^ `` Title 29 - A, § 2070 : Passing another vehicle ''. mainelegislature.org. Jump up ^ Illinois Compiled Statutes Jump up ^ `` Title 75 ''. The official website for the Pennsylvania General Assembly. ^ Jump up to : `` State `` keep right '' laws ``. mit.edu. Jump up ^ You can drive on the left lane as long as you go fast Alberta, Canada Government - Road Signs ( Slower Traffic Keep Right ) Jump up ^ AASHTO Subcommittee on Traffic Engineering : Passing Lane Study Jump up ^ https://www.theglobeandmail.com/globe-drive/culture/commuting/left-lane-etiquette-and-tailgating-consequences/article4249182/?service=mobile External links State `` keep right '' laws Streets and roadways Types of road Limited - access Freeway / Motorway Dual carriageway / Divided highway / Expressway By country Brazil Croatia Czech Republic Germany Greece Hong Kong India Ireland Italy Pakistan Portugal Spain United Kingdom United States Main roads Arterial road Collector road County highway Express - collector setup Farm - to - market road Highway Link road Two - lane expressway 2 + 1 road 2 + 2 road Parkway Super two Trunk road Highway systems by country Local roads Alley Backroad Bicycle boulevard Boulevard Country lane Dead end Driveway Frontage road Green lane Main street Primitive road Road Side road Single carriageway Single - track road Street Sunken lane Other terms Channelization Concurrency Detour Hierarchy of roads Private highway Route number Special route Business route Street hierarchy Toll road Road junctions Interchanges ( grade - separated ) Cloverleaf Diamond Free - flow Directional T Diverging diamond Parclo Raindrop Roundabout Single - point urban ( SPUI ) Stack Three - level diamond Trumpet Intersections ( at - grade ) 3 - way junction Bowtie Box junction Continuous flow Hook turn Jughandle Michigan left Offset T - intersection Protected intersection Quadrant roadway Right - in / right - out ( RIRO ) Roundabout Seagull intersection Split intersection Superstreet Texas U-turn Traffic circle Turnaround Surfaces Asphalt concrete Bioasphalt Brick Chipseal Cobblestone Concrete Reinforced concrete Corduroy Crocodile cracking Crushed stone Diamond grinding of pavement Dirt Full depth recycling Glassphalt Gravel Ice Macadam Pavement milling Permeable Plank Rubberized asphalt Sealcoat Sett Stamped asphalt Tarmac Texture Road hazards Aquaplaning Black ice Bleeding Crosswind Dead Man 's Curve Expansion joint Fog Ford Hairpin turn Level crossing Manhole cover Oil spill Oversize load Pothole Road debris Road slipperiness Road train Roadkill Rockfall Rut Speed bump Storm drain Washboarding Washout Whiteout Space and time allocation Barrier transfer machine Bicycle lane Climbing lane Complete streets Contraflow lane Contraflow lane reversal High - occupancy toll lane High - occupancy vehicle lane Lane Living street Managed lane Median / Central reservation Motorcycle lane Passing lane Pedestrian crossing Pedestrian zone Refuge island Reversible lane Road diet Road verge Runaway truck ramp Shared space Sidewalk / Pavement Shoulder Street running railway Traffic calming Traffic directionality Traffic island Traffic lanes Traffic signal preemption Unused highway Wide outside lane Woonerf Demarcation Bollard Botts ' dots Cable barrier Cat 's eye ( road ) Concrete step barrier Constant - slope barrier Curb F - Shape barrier Guard rail Jersey barrier Kassel kerb Noise barrier Raised pavement marker Road surface marking Rumble strip Traffic barrier Traffic cone Structures Bridge Causeway Overpass / Flyover Underpass / Tunnel Glossary of road transport terms Road types by features Retrieved from `` https://en.wikipedia.org/w/index.php?title=Passing_lane&oldid=799466026 '' Categories : Road infrastructure Hidden categories : Webarchive template wayback links All articles with unsourced statements Articles with unsourced statements from November 2016 Articles with unsourced statements from December 2011 Talk Contents About Wikipedia Bahasa Melayu 日本 語 Edit links This page was last edited on 7 September 2017, at 22 : 04. About Wikipedia

Question: what is the left lane of a motorway used for
Answer: passing