Sharraxaadda

I have a city tree at the curb that has a sizeable but not destructive long, but small limb down on the "house side" of the tree. I would like some information about how I should take care of this since it is a city tree. The limb is down and covering my front walk, but doesn't impede any traffic and it is too high for me to reach. I'd like some advice before I attempt to remedy the situation on my own and potentially cause a problem since this is a "city tree". Thanks! - Nichole Elkins