While I'll use ISO symbols in my maps sometimes, I only do so when issues of things hidden behind the mountains does not apply. If this is an issue, I never use ISO, rather sticking with top down only. If you have to do something odd so your map readers can understand, then don't do it. Make it obvious using the right style. You never want to confuse your reader... my 2 cents.
GP



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There were a few adrenaline filled moments until we started noticing those, and I'm pretty sure the gps voice took on a frustrated tone as we apparently continually ignored it's instructions to turn left on a one way street going right



