February 20, 201214 yr For those of you who use ELS, what is your favorite pattern to use, or does it depend on the vehicle/lightbar? I generally use X-03 for anything with lightbars, with just C-01 for the traffic adviser bar, unless I'm on a stop, for which I will change it to L-03 or R-03, respective to which side of the road I am on. I love X-03, as it's constant and eye-catching, even from a long distance. For unmarked cars, or slicktops, I'll use B-01 or B-03. For detective cars or something with just a deck light, I'll just use A-04 or A-06.