Work zone impact thresholds
Florida uses a lane closure analysis (LCA) to determine the time of day the contractor is allowed to work.
This analysis takes into consideration:
ATC = Actual Traffic Counts
P/D = Peak Traffic to Daily Traffic Ratio
D = Directional Distribution of peak hour traffic on multilane roads
PSCF = Peak Season Conversion Factor
RTF = Remaining Traffic Factor
G/C = Ratio of Green to Cycle Time
V = Peak Hour Traffic Volume
C = Capacity of a 2L, 4L or 6L roadway
RC = Restricting Capacity
OF = Obstruction Factor
WZF = Work Zone Factor (WZF) is directly proportional to the work zone length
TLW = Travel Lane Width
LC = Lateral Clearance
Florida factors adjustments for signalized intersections in urban areas. This factor is to be applied when lane closure is through or within 600 ft of a signalized intersection. The Office of Traffic Engineering has timing cycles for all traffic signals.
Some districts do not allow any lane closures on interstate during daylight hours no matter what the LCA shows.
Construction enforces work time restrictions in the field.