will have additional officers on scene for back-up, often waiting for additional officers to join up before initiating the stop. They will typically have their weapons drawn, and stay back from the suspect's vehicle, using their patrol cars for cover. If there is no choice but to make the stop on a busy street, then they will often stop traffic. They will address the driver and any passengers over the PA speaker of the patrol car, typically instructing the driver to turn the engine off, remove the keys from the ignition, and sometimes toss them out the window. They will instruct the occupants, one at a time, to exit the vehicle with empty hands showing, place their hands on top of or behind their heads, walk backwards some distance, and then lie flat on the ground, where they will remain until all occupants have done likewise, at which point officers will move up, apply handcuffs, do a body search and then secure the suspects in the patrol cars. The vehicle is then typically searched for weapons and other evidence in accordance with the arresting department's standard operating procedures ("S.O.P.'s"). The Supreme Court has held that an officer who stops a vehicle as part of a routine traffic stop has the authority to order the driver to exit the vehicle, as well as to order any passengers to exit the vehicle. Federal government The United States federal government has long used local traffic enforcement as a tool to further its goals through providing funding and training. Historically, this goal has been drug interdiction, but this has been expanded to include the War on Terror. Currently, the National Highway Traffic Safety Administration (NHTSA) in cooperation with two agencies in the United States Department of Justice (the Bureau of Justice Assistance and the National Institute of Justice) actively promote a program called Data-Driven Approaches to Crime and Traffic Safety (DDACTS) which provides training to local police forces to combine traffic enforcement with fighting crime. In the past, such approaches have been accused of promoting racial profiling. Controversy Reducing minor traffic stops Several states and cities have restricted or discouraged minor traffic stops, such as for broken equipment, to avoid dangerous interactions between drivers and armed law enforcement, which put both police and drivers at risk and lower trust in the police. Nationally, 43% of traffic stops are for speeding, 24% for broken equipment,