It is not legal to speed to pass in most states. I've only found Wyoming, Idaho, Minnesota and Washington have such a law on the books, up to 10mph over the pos

It is not legal to speed to pass in most states. I've only found Wyoming, Idaho, Minnesota and Washington have such a law on the books, up to 10mph over the posted speed limit. For sure in Colorado it's not legal to exceed the speed limit to pass. But it is illegal to drive below the speed limit while in the passing lane on a highway with a speed limit 65 mph or higher. There's exceptions for safety and congestion, but otherwise the left lane is considered a passing lane. If you're not passing, you're not supposed to be in that lane.