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Jurisdictions in the United States (including overseas territories) and Canada have adopted various school bus stop laws that require drivers to stop and wait for a stopped school bus loading or unloading, so as to protect school children boarding or alighting.
Generally, if a stopped school bus is displaying a flashing, alternating red lamp, a driver of a vehicle meeting or overtaking the stopped bus from either direction (front or back) must stop and wait until the bus moves again or the red light is off. Police officers, school crossing guards, and even school bus drivers themselves may have the power to wave traffic on, even when a red light is flashing.
On divided highways, most American and Canadian jurisdictions do not require vehicular drivers to stop when on the opposite side of the road from a stopped school bus. Those that do require vehicles to stop are:
American and Canadian jurisdictions have sought to deter illegal passing stopped school buses by increased enforcement and heavy penalties, including fines, application of demerit points against a driver's license or even license suspension. Nevertheless, violations are common. An officer must witness the violation, and even when citations issued, getting convictions is often difficult; sometimes traffic courts consider the evidence insufficient, or reduce the charge because the penalty for a first offense seems excessive. There are, however, exceptions. Missouri has Jessica's Law, which grants the right of a school bus driver to report the offense, in which case the driver is automatically cited. Cobb County, an urban county in Metro Atlanta, has added bus cameras, as a deterrent, which can detect and automatically report vehicles passing a bus.  
Drivers in Washington state are not required to stop for a school bus on any highway (Under Washington law, any public road is defined as a highway) with three or more lanes when traveling in the opposite direction. This has been interpreted to mean that when approaching a bus from the opposite direction on a normal road with a turn lane, or a road with two lanes in each direction, etc., a driver is not required to stop their vehicle. This is an unusual law, but arguably leads to a higher safety level for children, as they are then required to be dropped on the same side of the road as the bus exit on anything greater than a two-lane road as provided by RCW 46.61.370. Ohio has a similar exception for roads with four or more lanes.
In Pennsylvania, the only vehicle that may pass a stopped school bus with the red lights flashing is an emergency vehicle with its flashing lights and siren activated, but only after the emergency vehicle has come to a complete stop and proceeds with due caution for any students embarking or disembarking. 
In New York State, an official estimate is that 50,000 vehicles pass stopped school buses illegally every day. However, as New York State requires traffic to stop for a school bus stopped on the opposing roadway of a divided highway, the estimate may include "New York violations" that would be legal in other states. The New York State Department of Transportation once recommended that the State Legislature exempt traffic from stopping for a school bus stopped on the opposing roadway of a divided highway, but this has not been done.
On a national basis, school bus drivers in the United States have reported a decrease in passing violators in recent years with improved warning devices. Despite an increase in traffic and school bus ridership, annual fatalities and injuries to children struck by other vehicles has decreased as well. However, it is unclear whether having reported a decrease in passing violators is due to difficulty to report or better compliance by motorists.
When and where enforcement against violators becomes too hard, some residential streets may prohibit entry of vehicles other than school buses at certain times to effectively eliminate passing stopped school buses illegally.
Bus drivers are prohibited to turn around at intersections with students on the bus. If laws are broken, the bus driver may be charged with including but not limited to: child endangerment and disobeying laws. This section may not include all laws or bylaws.
Drivers are not required to stop if the school bus is approaching along an opposite lane of travel separated by a median twenty feet or more in width
when you see a school bus with alternating flashing red lights at the top, you must stop whether you are approaching it from the front or the rear. Vehicles in all lanes must stop.
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