NACTO calculates that a typical sidewalk can accommodate 9,000 people per hour or 60 people per meter per minute, allowing 1.5 m2 (16.15 ft2) per pedestrian and a 75 meters (246 feet) per minute walking speed. (1)
Assuming a SF parking space is around 10 feet (3 meters) wide, a parking space repurposed as sidewalk could potentially move 120 people per minute or 7,200 per hour through parking-lane-as-sidewalk.
An equivalent street lane width of 10 ft exclusively occupied by private motor vehicles is estimated at 600-1,600 persons per hour, assuming 600-800 vehicles per hour and 1-2 passengers per vehicle (2). Taking the upper bound for vehicles, 1,600 people/hour can move through parking-lane-as-dedicated-private-traffic-lane.