The 'Number of Lanes' report presents statistics for fatal crash events for large trucks and buses by the number of lanes in the roadway where the crash occurred.

Reportable crash: A crash is reported to FMCSA if it involves a truck, bus or any vehicle displaying a hazardous materials placard AND that vehicle is involved in a crash while operating on a roadway customarily open to the public, which results in a fatality, an injury or a towaway.

Filter	Description
Data Source	The Crash Statistics module provides users an ability to view crash data reports either from MCMIS or FARS. 1) MCMIS includes crashes involving trucks and buses that are reported by states to the FMCSA through the SAFETYNET computer reporting system. It includes data elements collected on trucks and buses that meet the NGA recommended crash threshold. The FMCSA operates and maintains the MCMIS. 2) FARS is a census of crashes involving any motor vehicle on a trafficway, but only includes fatal crashes. FARS is maintained by the National Highway Traffic Safety Administration (NHTSA).
Domicile	By default, the domicile filter is set to "All Domiciles". The following options are available: 1) All domiciles includes all carriers domiciled in the United States, Mexico, Canada, and some foreign countries. 2) United States includes carriers domiciled in the United States. 3) Mexico includes carriers domiciled in Mexico. 4) Canada includes carriers domiciled in Canada.
Vehicle Type	By default, the vehicle type filter is set to "Large Trucks & Buses". The following options are available: 1) Large Trucks & Buses include all trucks and buses. 2) Large Trucks include all vehicles designed, used, or maintained primarily for carrying property, with a gross vehicle weight rating or gross combination weight rating of more than 10,000 pounds, or any vehicle displaying a hazardous materials placard. 3) Buses are vehicles designed to transport nine or more people, including the driver.
Report Focus	By default, the report focus filter is set to “All States”. The following options are available: 1) All States includes all States and the U.S. territories. 2) National is a summary of all States data and the U.S. territories. 3) State includes one State’s data.
Time Period	The Calendar or Fiscal year when the crash events occurred.
Crash Type	By default, the filter is set to "All Crashes". 1) All Crashes include fatal and non-fatal crash involvements. 2) Fatal Crashes include crash events where one or more persons dies within 30 days of the crash. The fatality does not have to occur at the scene of the crash. It includes any person involved in the crash, including pedestrians and bicyclists, as well as occupants of the passenger cars. 3) Injury Crashes include crash events that resulted in at least one injury requiring immediate medical attention away from the crash scene. 4) Towaway Crashes include crash events where at least one vehicle incurred disabling damage as a result of the crash and was towed from the crash scene.

Column Name Description One Lane One lane roadway Two Lanes Two lane roadway Three Lanes Three lane roadway Four Lanes Four lane roadway More Than Four More than four lanes in the roadway Missing All ‘missing’ represent a blank data field in FARS. Unknown Unknown represents the number of lanes could not be determined.