From ee6f6ecf618c4fa296f1727d7b40db51627d11ca Mon Sep 17 00:00:00 2001
From: david <david>
Date: Fri, 4 Oct 2002 00:23:40 +0000
Subject: [PATCH] Turn the runway lights on during the day when visibility is
 less than 5000m (about 3SM).

---
 src/Objects/obj.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Objects/obj.cxx b/src/Objects/obj.cxx
index 0ecf55d75..8abd10ce0 100644
--- a/src/Objects/obj.cxx
+++ b/src/Objects/obj.cxx
@@ -78,7 +78,8 @@ runway_lights_predraw (ssgEntity * e)
 {
                                 // Turn on lights only at night
     float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
-    return int(sun_angle > 90.0);
+    return int((sun_angle > 90.0) ||
+               (fgGetDouble("/environment/visibility-m") < 5000.0));
 }