Your chances of being killed in traffic while biking are less than for walking, but over ten times that for traffic and , 10 per 100 million miles, on an estimated 7 billion miles traveled per year. At the average speed of 11 MPH, the chance of dying is 110 per 100 million hours.
The width a bike lane is 4 feet, to allow the same comfort of steering for 2.5 foot wide bikes as for cars in their lanes. The space taken up by a biker in a lane is 6x2 ft, and the distance needed for stopping for the average biker is 33 feet, meaning that each bike consumes 156 SF of lane space. The storage space for a bike is also 12 feet, so the total space requirements of a bike is 170 SF, or 0.4% of an acre, 8 percent of the space requirements of a car.
The capacity of a bike lane is 2,300 pph. As with pedestrians, the energy consumed is personal, 185 BTU/mile.
The cost of building a separate 8-foot bike lane is 175,000/mile. As these bike paths are at least 2 lanes wide, making the cost of a lane $83,000 per mile. The cost of maintenance for these paths is $7,000 per mile per year. Bike paths, like sidewalks, are built as part of road projects, and are financed 30% by the gas tax-funded highway trust fund.