Instructor and student turn down parallel runway instead of taxiway after landing.

Attributes
ACN	130813
Time
Date	198912
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : myf
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : atp pilot : private
Experience	flight time last 90 days : 150 flight time total : 2150 flight time type : 2125
ASRS Report	130813
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	incursion : runway non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After landing the aircraft, my student remained on runway 28R, then turned left on runway 23, then made a left turn on runway 28L thinking it was a taxiway G. I saw the aircraft that was on final to 28L, and then expedited to the nearest taxiway, C, to my right. Runway 28L, at the intersection of 23 and 28L, should be marked in some way. The controller should have had the aircraft on 28L go around a lot sooner. The controller spent too much time trying to get our aircraft off the runway. We took the fastest, shortest route off of 28L, which was taxiway C.

Original NASA ASRS Text

Title: INSTRUCTOR AND STUDENT TURN DOWN PARALLEL RWY INSTEAD OF TXWY AFTER LNDG.

Narrative: AFTER LNDG THE ACFT, MY STUDENT REMAINED ON RWY 28R, THEN TURNED LEFT ON RWY 23, THEN MADE A LEFT TURN ON RWY 28L THINKING IT WAS A TXWY G. I SAW THE ACFT THAT WAS ON FINAL TO 28L, AND THEN EXPEDITED TO THE NEAREST TXWY, C, TO MY RIGHT. RWY 28L, AT THE INTXN OF 23 AND 28L, SHOULD BE MARKED IN SOME WAY. THE CTLR SHOULD HAVE HAD THE ACFT ON 28L GO AROUND A LOT SOONER. THE CTLR SPENT TOO MUCH TIME TRYING TO GET OUR ACFT OFF THE RWY. WE TOOK THE FASTEST, SHORTEST ROUTE OFF OF 28L, WHICH WAS TXWY C.

Data retrieved from NASA's ASRS site as of August 2007 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.