I drive a utility truck and have only amber flashing beacon lights. At one time on another truck I had Blue and Amber. The Blue was great at night, but for some reason they took them off and replaced with amber. I was told that for out of state trips through Louisiana the blue was against their law. So how about Tx. From what I understand blue is OK. Just not red showing from the front. The blue really made traffic slow down a bit more, but with only amber they blow by like nobodys business.