Monroe County tracks traffic on US1 to make sure the roadway provides capacity for cars to flow freely without backlog. This is measured like school grades. The acceptable grade is level of service “C.” During 2019, consultants conducted a study of traffic levels called U.S. 1 Arterial Travel Time and Delay Study. This 2019 study showed the overall level of service of U.S. 1 had fallen below “C” level. Several segments have also fallen to level D or lower, particularly in areas inside municipalities in the Florida Keys.
Under the County’s code, when this happens, all new development (except single family home development) is required to contribute to improvements that would allow traffic to flow better. The County’s traffic consultant that conducted the 2019 study indicated there were several issues with the method used to measure level of service including inconsistencies with the current national Highway Capacity Manual; differences in segment versus overall level of service measurement; how delay for the Snake Creek drawbridge opening is treated; and if the study’s travel time schedule accurately reflects current traffic conditions.
Therefore, the Monroe County Board of County Commissioners decided to continue using the 2017 U.S. 1 Arterial Travel Time and Delay Study until a task force is formed to evaluate and update the method of the study. The County Commission previously approved development of a Transportation Master Plan to identify improvements that can be made on U.S. 1 or other roadways to improve traffic flow.