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Most roads in America can accommodate both Pedestrians and Vehicular traffic (They were designed that way, now the Pedestrians generally are second class but the law in the US is quite clear, if you have to choose between Pedestrian or Vehicular Traffic, it is Cars that must be banned. To do this, some, generally not great, but some, accommodation is made for pedestrian traffic).
Now the accommodation for pedestrian Traffic may also be the break down lane, it may be a narrow curb, but it does exist. Thus it is RARE for pedestrian traffic to block traffic. Now a lot of Auto traffic do NOT like passing pedestrians (And slow down when they do) but that is NOT prevent the traffic from moving.
My point here is people WALKING OUT OF NEW ORLEANS pose no threat to block any aid from coming in. Thus why did the Police point their guns? The police are hearing the same reports we are hearing and decided that the best way to keep the "Gangs" away from the areas they are in is to block them from leaving. This was reinforced by them having make shift packs, in the eyes of the Police they were looting and did not want the looters in their neighborhood. Now the police are people and go by the best available information to them, thus they are as capable of being stupid as the next person. Sometime you have to remind them of their job (For example say you are NOT going back as this person did BUT also don't argue with them and don't fight them, that generally frustrates them and they leave you go on your way, if you fight them they may shoot you).
Now before someone says I know of a road pedestrians can NOT walk on, I have the following comments:
1. Is it a limited access or Interstate Highway? If yes, such roads are rarely design for pedestrian travel, but almost always follow an older state road THAT DOES ACCOMMODATE PEDESTRIANS.
2. Is is a state road that has no sidewalks? Does it have curb? Yes you can walk on a curb (I have done so on many a road) it is a narrow (six inch wide) path but passable. Does it have a break down land? If yes, you can walk on the Break down lane (Most state highways have break down lanes that not only provide people a place to park their cars if it breaks down, but permit water to roll off the road surface onto the surrounding land). Again, you have to deal with a high volume of traffic but it is still walkable.
It is rare to have a road that does NOT have some sort of edge to it (and many have grass edges). It is hard for pedestrians to block traffic on today's roads (The same CAN NOT BE SAID OD CARS, cars can block roads for emergency supplies, and thus should be stopped from using the highway system).
3. Yes I have seen roads blocked by a large number of Pedestrians, especially after they leave some sort of "event" (Football game, Concert, etc) but that is rare and quickly spreads out. Thus after 5-10 minutes the "mob" is a long line that emergency vehicles can easily get around (Unlike cars in a similar situation that block by their size the use of the roads to emergency vehicles). Thus pedestrians rarely, if ever, block traffic FOR EMERGENCY VEHICLES OR SUPPLIES. The same can NOT BE SAID OF CARS.
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