For as long as many of us can remember, it's been red, yellow, green. Granted, in some places, you see a separate part of the light that shows protected greens or yellow or whatever. But generally, the 3-color combo is what we've known.
Whatever initially occurred between the two drivers, it's hard to watch. East Texas is typically known for mannerly behavior--relatively speaking, at least.
Their official name is pneumatic road tubes.
These tubes are flexible rubber tubes stretched across a roadway. They work by compressing air as vehicles pass over them. Pressure change reveals much information as it is sent to data collection devices.