Answer:
Facing the traffic flow.
Step-by-step explanation:
While walking along a highway where there are no sidewalks, it is best to walk along the side of the traffic where one is able to see the oncoming traffic. This way, it will enable the person to be conscious of the traffic with both his ears and eyes. He will be able to see and hear the vehicular movement and thus, steer clear of any possibility of accidents, for the traffic is coming towards him.
On the other hand, if a person walks along with the traffic flow, then he will have to rely only on his ears for the traffic and be blind against any oncoming vehicle from behind. This will pose a greater risk for the person walking on the highway.
Thus, it is best to walk on the shoulder facing the traffic flow.