Almost on topic: a quote from John Good's report from WGC2017:

"One notable quirk is a requirement for flashing yellow lights on all vehicles that drive onto the airfield. This curious rule comes not from the contest organization, the gliding club, or the Australia aviation authorities, but rather from the local town government. In the (dangerously) bright Victoria sunlight, a flashing yellow light improves vehicle visibility by a distance measured in centimeters (in some cases you have to look closely to determine that the light is indeed on)."