AA757MIA
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Taxing On The Left Lane On A Two Way Taxiway

Mon Apr 27, 2009 10:25 am

For quite some time I've been wondering why most of the time (because I think it is not all the time) aircrafts taxi on the left side on two way and/or parallel taxiways? I imagine taxing in an aircraft has nothing to do with traffic rules, but at least in this side of the world we're used to drive on the right lane.

This picture reminded me to ask the question, but I've also noticed it when flying myself.
http://www.airliners.net/photo/-/-/1516780/L/

Is there any rule or it all depends on the ATC, active runways, etc?



[Edited 2009-04-27 03:40:20]
 
OPNLguy
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RE: Taxing On The Left Lane On A Two Way Taxiway

Mon Apr 27, 2009 1:09 pm

Quoting AA757MIA (Thread starter):
For quite some time I've been wondering why most of the time (because I think it is not all the time) aircrafts taxi on the left side on two way and/or parallel taxiways? I imagine taxing in an aircraft has nothing to do with traffic rules, but at least in this side of the world we're used to drive on the right lane.

This picture reminded me to ask the question, but I've also noticed it when flying myself.

The aircraft in the ATL picture aren't on "taxiways" per se, just the ramp areas between the councourses. I can't think of any taxiways anywhere that are two-way, since they'd have to be so wide as to permit proper wingtip clearance between a wide variety of types of aircraft. For all practical purposes, taxiways are one-way so as to maintain separation from other aircraft while on the ground.

As far as large ramp areas like ATL, I suppose it's up to the local airport to establish procedures based on their airport's runway configuration and traffic demands.

http://204.108.4.16/d-tpp/0904/00026AD.PDF

[Edited 2009-04-27 06:10:45]
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
BigSaabowski
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RE: Taxing On The Left Lane On A Two Way Taxiway

Mon Apr 27, 2009 1:30 pm

In ATL, it's up to the ramp controller to decide which lane to use for which direction and it may change every 10 minutes or so depending on the traffic situation. For example, the 2 aircraft on the top right of the picture were told to take the left lane north and contact ground on 121.9. Just as often, aircraft will exit that ramp (#3) on the right lane.
 
pilotpip
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RE: Taxing On The Left Lane On A Two Way Taxiway

Mon Apr 27, 2009 4:14 pm

And it's not unusual to shuffle back and forth a couple times between the left and right side if you have to go around a few aircraft to/from your gate.

DEN is somewhat similar but there is enough space that you can put a number of aircraft next to each other between the terminals.
DMI
 
Alias1024
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RE: Taxing On The Left Lane On A Two Way Taxiway

Mon Apr 27, 2009 9:31 pm

Some airports have two way taxiing on wider taxiways for light aircraft. Daytona Beach is a good example. It's very common to see C-172s taxiing in opposite directions on their way to and from 7L. Though each stays on the right side, not the left.

Quoting Pilotpip (Reply 3):
DEN is somewhat similar but there is enough space that you can put a number of aircraft next to each other between the terminals.

Totally unrelated, but Denver ramp control blows! I can't count the number of times I've heard the following from ground control: "ramp sent you out the wrong side. Two right turns, Bravo November to reenter, contact ramp". Ok, rant over.  Big grin
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pilotpip
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RE: Taxing On The Left Lane On A Two Way Taxiway

Mon Apr 27, 2009 9:59 pm

I agree 100%.

My favorite was not one but two 180s in the middle of the ramp as they sent us to different sides of the field. Also prompted one of the funniest PA announcements I've ever heard. "Ladies and Gentlemen, we had to pull over and ask for directions at the gas station but I promise we now know where we are going."  Smile
DMI
 
thegreatchecko
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RE: Taxing On The Left Lane On A Two Way Taxiway

Tue Apr 28, 2009 4:51 am

I just wish Denver ramp control could learn two things:

1. How to key their mics properly. They always seem to start talking before the mic is keyed and half of the call sign is cut off.

2. That "we" usually can't tell if we are stepping on someone on frequency when we talk and telling us to listen up doesn't help either.

Checko
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AA757MIA
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RE: Taxing On The Left Lane On A Two Way Taxiway

Tue Apr 28, 2009 4:18 pm



Quoting Pilotpip (Reply 3):
DEN is somewhat similar

Yup, DEN is one of the airports where I have noticed it, same thing at DFW when crossing the bridges.
 
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Francoflier
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RE: Taxing On The Left Lane On A Two Way Taxiway

Tue Apr 28, 2009 8:26 pm



Quoting AA757MIA (Thread starter):
taxi on the left side on two way and/or parallel taxiways?

Each airport has a 'preferential' taxi chart that is a basic guideline of how the aircrafts should be taxied between the runways and ramps. Many large airports with parallel taxiways assign a specific direction of taxi to each of them for easier flow control. There is no left or right preference, it all depends on the airport layout.

Although at the end of the day, it's all down to the ground controller, and some airports can get pretty 'messy' on the ground. Especially those older ones which grew out of their planned capacity and/or have been empirically extended on restricted real estate...
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thebatman
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RE: Taxing On The Left Lane On A Two Way Taxiway

Fri May 29, 2009 12:37 am

At O'Hare, between the B and C concourses, the general rule is "in from the North, out through the South". So, you generally see both "lanes" going in the same direction. There are exceptions, of course. Generally, 777's and 747's at B-17 will come in and out from the North. Terminals 2 and 3 use an alley system, which is generally a train wreck.

As far as ground traffic on the taxiways goes, depending on the runway configuration, taxiway "A" will move North, and "B" will move South. Again, this is up to the ground controller. As you can imagine, things can get pretty hairy sometimes. But generally speaking, the controllers at ORD do an incredible job.
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