Slc local controller and B737 flight crew reported a runway incursion due to taxiway confusion.

Attributes
ACN	1614559
Time
Date	201902
Local Time Of Day	1801-2400
Place
Locale Reference	SLC.Airport
State Reference	UT
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 1
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Conflict Ground Conflict Less Severe Deviation - Procedural Clearance Ground Incursion Runway

Narrative:

Aircraft X was cleared to land on runway 16L with aircraft Y holding short of 16L waiting to depart. Another aircraft was crossing a 4.5NM final for 16L and aircraft X was told to expedite to H4 (a high speed taxiway) to clear the runway and taxi to their gate. Aircraft Y was instructed to line up and wait on 16L. Aircraft X turned early at H5 but was observed clearing the runway; aircraft X was then instructed to cross the hold-bar and contact ground. Aircraft Y was cleared for takeoff and issued a departure heading of 160 and they began their takeoff roll. Aircraft X then turned back onto the runway to take the exit at H4. Aircraft Y's takeoff clearance was cancelled and they were instructed to exit at H11; which they did; and were given new taxi instructions to return to runway 16L full length (H13). Aircraft X was issued a brasher statement from the ground controller and instructed to contact the tower by telephone. The aircraft on final landed and aircraft Y [was] then able to depart with no further issues.

Original NASA ASRS Text

Title: SLC Local Controller and B737 flight crew reported a runway incursion due to taxiway confusion.

Narrative: Aircraft X was cleared to land on runway 16L with Aircraft Y holding short of 16L waiting to depart. Another aircraft was crossing a 4.5NM final for 16L and Aircraft X was told to expedite to H4 (a high speed taxiway) to clear the runway and taxi to their gate. Aircraft Y was instructed to line up and wait on 16L. Aircraft X turned early at H5 but was observed clearing the runway; Aircraft X was then instructed to cross the hold-bar and contact Ground. Aircraft Y was cleared for takeoff and issued a departure heading of 160 and they began their takeoff roll. Aircraft X then turned back onto the runway to take the exit at H4. Aircraft Y's takeoff clearance was cancelled and they were instructed to exit at H11; which they did; and were given new taxi instructions to return to runway 16L full length (H13). Aircraft X was issued a brasher statement from the Ground Controller and instructed to contact the Tower by telephone. The aircraft on final landed and Aircraft Y [was] then able to depart with no further issues.

Data retrieved from NASA's ASRS site 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.