(This is not a Duplicate; a some what similar Topic was closed in 2016)
MazSez: Let’s clarify a critical point once and for all; “RED RUNWAY END MARKERS ARE NOT CLOSED RUNWAY MARKERS”!!! Red/Green runway lighted end of runway/threshold lighted delimiters where introduced in IF back in the day, prior to live! At that time, pre-ATC, Red runways Light Bars indicated “Closure”. This action was initiated to control the traffic flow only and facilitate downwind evolutions for Fledglings. With the introduction of Live/ATC the Red Bar Closure initiative for Flow control was discontinued. Red runways now at almost all IF Airfield merely indicate the red end marker is upwind to some degree (Up Wind=Tail/Cross wind to some degree.). As for useage at controlled field ATC will determine the severity and direction of prevailing wind and can route traffic to a Red Runway (Active) at their pleasure. At uncontrolled airports it’s a Pilots choice to use the Red Runway if it does not counter the prevailing traffic flow or wind/direction is below airframe aerodynamic capability. (All aircraft airframe are calibrated during airworthiness certification. Wind/Crosswind tolerances are published for each aircrafts by types in a Pilots Operation Handbook (POH), Quick Reference Guide (QRF) or Air Worthy document etc). Since aircraft certification documentation are not readily available to members to determine aircraft wind tolerance the IFATC rule of 10 applies. Winds 10 Kts and under in any direction, your good to go,., Exception, your good to go as long as you follow the flow where there is traffic in the pattern, at the threshold or a landing/take off evolution on the runway of choice is progressing. (The Rule of 10 and runway selections noted apply on all servers).
Fly like a Pro; Communicate, Aviate & Navigate… Gooday!