As other response mentioned what it is, look at this image for get an idea how it looks: https://www.airteamimages.com/---__-_94189_large.html https://www.airte

As other response mentioned what it is, look at this image for get an idea how it looks: https://www.airteamimages.com/---__-_94189_large.html https://www.airteamimages.com/---__-_94189_large.html. It is present on the entry side of most runway.