@leBluem posted one here:
https://www.gtplanet.net/forum/thre...ral-discussion.307899/page-1908#post-13281694
Should work for all Istanbul tracks based on Acu´s version. Just extract into track folder.
You can also add this part at the end of the ext_config file inside the extension folder to add the green lights to the semaphore
;;;;;;;;;;;;;;;; SEMAPHORE ;;;;;;;;;;;;;;;;
[CustomEmissive]
ACTIVE = 1
DESCRIPTION = Pitlane Semaphore
MATERIALS = lg_pit_exit_light_b
Resolution = 512, 512
SHADER=ksPerPixelMultiMap_emissive
@ = CustomEmissive_Rect, Channel = 1, Start = "37.9, 214.1", Size = "91.9, 85.5"
[MATERIAL_ADJUSTMENT_...]
ACTIVE = 1
VISIBILITY_LEVEL = 0
DESCRIPTION = Pitlane Semaphore
MATERIALS = lg_pit_exit_light_b
CONDITION = ALWAYS_ON
CONDITION = RACING_FLAG_LOCAL
KEY_... = ksEmissive1
VALUE_... = 255,255,255, 0.25
KEY_... = ksAlphaRef
VALUE_... = -193
[CustomEmissive]
ACTIVE = 1
DESCRIPTION = Pitlane Semaphore
MATERIALS = core_start_lights_a
Resolution = 256, 512
SHADER=ksPerPixelMultiMap_emissive
@ = CustomEmissive_Rect, Channel = 1, Start = "35, 388.3", Size = "98.4, 79.5"
[MATERIAL_ADJUSTMENT_...]
ACTIVE = 1
VISIBILITY_LEVEL = 0
DESCRIPTION = Pitlane Semaphore
MATERIALS = core_start_lights_a
CONDITION = ALWAYS_ON
CONDITION = RACING_FLAG_LOCAL
KEY_... = ksEmissive1
VALUE_... = 255,255,255, 0.25
KEY_... = ksAlphaRef
VALUE_... = -193