I wonder if that's custom. The clips that hold them down are not in the middle where the split is. One could also get a similar effect by using a clear dome with rotator mounted filters. The splits that are really useful, IMHO, is a front to back split. That lets utility vehicles put more authoritative colors to the rear without having them on the front. Example, a construction vehicle could split red/blue to the rear and amber to the front. Then people get scared into slowing down, thinking there is a cop, yet that vehicle can't bust through traffic like one.