Military access flashing signal
https://www.codot.gov/projects/militaryaccesssafetyimprovements/projectphotos/co-94/pre-construction-photos/flashingsignal/view
https://www.codot.gov/projects/militaryaccesssafetyimprovements/projectphotos/co-94/pre-construction-photos/flashingsignal/@@download/image/IMG_2832.jpeg
Military access flashing signal