Landing Helicopters on Roads
The area must first be secured (but see below), with radio or verbal communication having taken place to confirm that you have authority to land there. Unaffected carriageways should be closed at all times.
Normally, you can only land at an unsecured site (i.e. where the police are not in attendance) in remote rural areas outside congested areas, but you may do so on dual carriageways (divided highways) or motorways (turnpikes) in daylight, where no traffic is moving—no landings should be made by night.
In any case, there must be no threat to persons or vehicles on the ground from the helicopter, or vice versa. Always be aware of the effects of your downwash, which may blow away crucial evidence, not to mention dislodging broken glass and other loose debris, particularly from damaged buildings, at bomb scenes.
Try not to land in school or other play grounds, or areas where children might be confined or suddenly emerge. Don’t use the aircraft presence or public address system to clear children from a site.

Parachute Dropping
In UK, no parachute dropping should be undertaken unless (as a pilot) you've been approved by the British Parachute Association and the parachutists themselves are in possession of an Operations Manual authorised by them. It’s probably similar elsewhere. You get your certificate by passing a check ride with a TRE, who in turn has been approved by the BPA. The normal regulations for the dropping of articles from aircraft also apply. In addition, the Flight Manual should include a Supplement to cover the situation. For some strange reason, parachutists do not seem to be classed as passengers or freight, so it's a good question as to whether a parachute trip is actually Commercial Air Transport or not. Check your insurance cover, even though on the way down they are not in the aircraft, and on the way up they are normal passengers.
Parachutists should be strapped in at all times except immediately prior to dropping, and before takeoff they should be shown how to secure seatbelts so they don't flap around in flight, as part of a proper briefing. There should be no loose articles in the cabin, and seats must be removed, as must be dual controls if one intends to drop from the front seat (of a helicopter). There should be no other passengers.
Don't use static lines and remove the doors (check the Flight Manual for limitations on flight without them).