Oh my gosh. I just learned ( http://wiki.answers.com/Q/How_..._interstate_highways ) that dashed lines on highways are 10 feet long, with 30-foot spacing. That translates in O-gauge to 2 1/2" lines and 7 1/2" spaces. That may be fine going across Arizona, but on smaller layouts, it seems grotesquely large. How much foreshortening of these dimensions do people use to make them seem realistic on layouts? I'm thinking of 1" lines and 3" spaces, but I hate to be so non-scale.
I'm researching this because a two-lane highway is going to be a prominent feature on my new layout, and I want it to fit gracefully into my O-scale setting. Thanks for any wisdom you can provide.