Rising bollards are increasingly common around the world to hinder vehicle-based terrorist actions from achieving close proximity to buildings, and are also used to prevent terrorist vehicle-ramming attacks such as the 2007 Glasgow International Airport attack. They are also useful in mixed-use public spaces, which support both pedestrian use and emergency or service vehicle use. These bollards are usually priced between $11,000 to $100,000 depending on their ability to resist ramming vehicles, based on speed and size of the vehicle. The most expensive bollards can stop vehicles at speeds of about .