I don't think there is anytime during the last 33 years during which I would have felt comfy about going to Iran. It's all to easy to all foul of the inflexibility of the rules in such a place, with drastic consequences likely. I spent two years in Saudi Arabia, that was enough for one life time!
Every time I took to the road, I was ashen with fear at the prospect of running one of them over, an all to likely prospect, given their own lack af attention to road safety, both on foot and behind the wheel.
FB