busdriver_phil
Senior Member
They're required by federal law, FMVSS 108.
http://www.ntea.com/uploadedFiles/NTEA_ ... _chart.pdf
Basically, you should put the lights back where they were. 3 in the center of the roof cap front and rear (6-12" spacing), one at each top corner, and one halfway down the length of the bus on each side (line up with the reflector at the bottom). Front and middle should be amber, rear should be red.
http://www.ntea.com/uploadedFiles/NTEA_ ... _chart.pdf
Basically, you should put the lights back where they were. 3 in the center of the roof cap front and rear (6-12" spacing), one at each top corner, and one halfway down the length of the bus on each side (line up with the reflector at the bottom). Front and middle should be amber, rear should be red.

