Air carrier flight crew reported observing the runway status light system turn red near the end of t...

Attributes
ACN	1439126
Time
Date	201704
Local Time Of Day	1201-1800
Place
Locale Reference	LAS.Airport
State Reference	NV
Environment
Light	Daylight
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 137
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 207
Events
Anomaly	Deviation - Procedural Published Material / Policy

Narrative:

We were cleared for takeoff on runway 25R in las. We began our power up and takeoff roll; however the aircraft engines were slow to spool up. As we began a slow takeoff roll; tower instructed the aircraft behind us on the taxiway to line up and wait on 25R. Also there was a company aircraft holding short of 25R at A5 waiting to cross to the ramp. As we got about halfway to two thirds through the red centerline lights lengthwise; they illuminated red. We both believed they were triggered for the aircraft lining up and waiting behind us; and tower never mentioned anything to us. We both verified the runway was clear in front of us. So we continued the takeoff roll and departed without any incident. However; it was a distraction to both of us.if the lights were indeed meant for the aircraft behind us; wait until we are past them to illuminate them. We could have double checked the takeoff clearance during the roll with ATC.

Original NASA ASRS Text

Title: Air carrier flight crew reported observing the Runway Status Light system turn red near the end of the takeoff roll from LAS Runway 25R; possibly due to an aircraft being cleared to line up and wait behind them.

Narrative: We were cleared for takeoff on Runway 25R in LAS. We began our power up and takeoff roll; however the aircraft engines were slow to spool up. As we began a slow takeoff roll; Tower instructed the aircraft behind us on the taxiway to line up and wait on 25R. Also there was a Company aircraft holding short of 25R at A5 waiting to cross to the ramp. As we got about halfway to two thirds through the red centerline lights lengthwise; they illuminated red. We both believed they were triggered for the aircraft lining up and waiting behind us; and Tower never mentioned anything to us. We both verified the runway was clear in front of us. So we continued the takeoff roll and departed without any incident. However; it was a distraction to both of us.If the lights were indeed meant for the aircraft behind us; wait until we are past them to illuminate them. We could have double checked the takeoff clearance during the roll with ATC.

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.

Air carrier flight crew reported observing the runway status light system turn red near the end of the takeoff roll from las runway 25R; possibly due to an aircraft being cleared to line up and wait behind them.