الأصل "Study Compares Older and Younger Pedestrian Walking Speeds" «Study Compares Older and Younger Pedestrian Walking Speeds» normal walking speed of 3 miles an hour «Study Compares Older and Younger Pedestrian Walking Speeds» Study Compares Older and Younger Pedestrian Walking Speeds average walking speed of an elderly person 1996 study on pedestrian walking speeds five kilometres per hour small fraction of a regular person on land 4 feet per second 4.5km/h normal walking speed of 3 miles an hour US study 4.5km/h