VicRoads has stated that a bike lane is able to carry three times as many people as a traffic lane:
Infrastructure Victoria‘s report Five-year focus: Immediate actions to tackle congestion states that cycling infrastructure can carry more than double the number of people that a car lane can:
Data from London shows that protected bicycle carry five times as many people as a vehicle lane:
National Association of City Transportation Officials (USA)
NACTO states that bicycle lanes carry roughly five times more people than a vehicle lane:
Best practice protected bicycle lanes transport more people than a traffic lane, so re-allocating street space to a bicycle lane will reduce peak hour congestion on the remaining lane, making our streets better for drivers.