In my State (Louisiana, USA), pedestrians may walk on the side of the road. No guidance is given on how fast they should walk. Pedestrians are not allowed to walk in the middle of the street. In the US, the laws for this will vary by state. Louisiana has statutes that say that pedestrians are bound by traffic laws, and obstruction of traffic is not legal on foot or in a vehicle. Basically, consult your local laws.
§216. Pedestrians on highways or interstate highways
A. Where sidewalks are provided, it shall be unlawful for any pedestrian to walk along and upon an adjacent highway.
B. Where sidewalks are not provided, any pedestrian walking along and upon a highway shall, when practicable, walk only on the left side of the highway or its shoulder, facing traffic which may approach from the opposite direction.
C. It shall be unlawful for any pedestrian to cross an interstate highway, except in the case of an emergency.
D. Upon conviction of a violation of this Section, a court may order, in lieu of the penalty provisions provided in R.S. 32:57, that the offender perform three eight-hour days of court-approved community service activities, at least half of which shall consist of participation in a litter abatement or collection program.
§213. Crossing at other than crosswalks
A. Every pedestrian crossing a roadway at any point other than within a marked crosswalk or within an unmarked crosswalk at an intersection shall yield the right-of-way to all vehicles upon the roadway.
B. Between adjacent intersections at which traffic-control signals are in operation pedestrians shall not cross at any place except in a marked crosswalk.
"Highway" means the entire width between the boundary lines of every way or place of whatever nature publicly maintained and open to the use of the public for the purpose of vehicular travel, including bridges, causeways, tunnels and ferries; synonymous with the word "street".