I've found that staggering the lights provides better illumination of the roadway and most lighting layouts seem to prefer it on streets and highways as well. The older freeway lighting here was staggered (aka light on the left, light on the right, light on the left, light on the right,...). On interstate 95 in the Providence area, the original 1957 davit poles remain, currently with 133w LED lights. Before that it was 250W HPS M-250R2s and before that assorted 400W MV lights (originally OV-25 flatbottoms).
Here's a link. There's two-headed poles on the Jersey barrier, which are spaced twice as far as normal, with single headed poles on the shoulders spaced evenly between the double headed poles. Problem is, you are now running three circuits the whole length of the freeway instead of one larger circuit. That's great for redundancy but it's a lot more conduit and cable no matter how you look at it. And some people think it looks "cluttered" with lights staggered down the road.