A B737-400 taxiing at mia had a near runway incursion because of confusing airport signage.

Attributes
ACN	714503
Time
Date	200610
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mia.airport
State Reference	FL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 110 flight time total : 22000 flight time type : 11000
ASRS Report	714503
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Airport Flight Crew Human Performance
Primary Problem	Ambiguous
Situations
Airport	markings : mia.airport

Narrative:

While taxiing on taxiway Q; signage at intersection of taxiway Q and T led us to believe we should make slight left turn to stay on taxiway Q. This actually turned us onto taxiway T that led to runway 12. This all occurs in a couple hundred feet. Stopped short of runway 12; made 180 degree turn to reenter taxiway Q.

Original NASA ASRS Text

Title: A B737-400 TAXIING AT MIA HAD A NEAR RWY INCURSION BECAUSE OF CONFUSING ARPT SIGNAGE.

Narrative: WHILE TAXIING ON TXWY Q; SIGNAGE AT INTXN OF TXWY Q AND T LED US TO BELIEVE WE SHOULD MAKE SLIGHT L TURN TO STAY ON TXWY Q. THIS ACTUALLY TURNED US ONTO TXWY T THAT LED TO RWY 12. THIS ALL OCCURS IN A COUPLE HUNDRED FEET. STOPPED SHORT OF RWY 12; MADE 180 DEG TURN TO REENTER TXWY Q.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.