Moscow Warnings Or Dangers Tips by TheWanderingCamel Top 5 Page for this destination

Watch out roadrunners! Traffic & Crossing Review

Everything you hear about Moscow traffic is true.
You don't even want to think about crossing a busy road above ground. Some of the roads are as wide as major highways and the drivers think they're on a racetrack. As for crosswalks -they're just an excuse to go faster.
Other traffic problems include monumental traffic jams. This is not such a problem for most tourists - you'll probably be using the metro to get around rather than being driven. If you are being escorted around by car however, these jams can seriously eat into the time you have to sightsee. If you can do so without causing offense, suggest you use the metro (you can always say it is on your list of Moscow "must-sees"). Otherwise you could end up spending a lot of your time smelling diesel fumes rather than the roses.

Maybe we were lucky .... Local police & Documents Review

but the only encounter we had with a policeman was when one came up to us at the concert in Red Square to celebrate the WW2 60th anniversary and asked us if we would like to go and sit down the front instead of standing!
I'm not saying people don't get hassled, and it really is necessary to have your passport or a copy of it on you at all times as well as your entry documents, and to be aware of how to deal with the situation if you do get stopped, but don't think it happens to everyone. I have no doubt that young travellers probably get stopped more than older visitors but times are changing in Russia and advice that is out of date could make you worry unecessarily.