Skip Line Cycle Layout and Stripe Count

Skip line is laid out on a cycle -- one stripe plus one gap -- and the count for a run is a division that decides how much paint goes on the truck. The arithmetic is trivial and the field consequences are not. On the common 10 ft stripe with a 30 ft gap the cycle is 40 ft, a mile carries 132 stripes and 1,320 feet of paint, and exactly a quarter of the run is painted -- which is a useful mental check on any pattern. Change to the 15 ft stripe and 25 ft gap some agencies use and the cycle is STILL 40 ft, the mile still carries 132 stripes, and the paint goes to 1,980 feet: half again the material for a line a driver would struggle to tell apart. Over a twelve mile job that is nearly eight thousand additional feet of stripe, which has to be on the estimate and is a reason to confirm the agency's pattern before ordering. THE LAYOUT REFERENCE MATTERS MORE THAN THE ARITHMETIC. A skip line laid out from wherever the truck happened to start puts a stripe in the middle of an intersection or across a driveway, and once a run is laid the whole pattern is fixed behind it. Laying out from a fixed point -- a joint, a station, the last stripe of the adjoining section -- is what keeps a pattern consistent across a project and across years of maintenance, and the offset here is that reference. For a maintenance crew the useful inversion runs the other way: count the stripes on an existing run, measure its length, and the division gives the cycle in place, which is the pattern the new work should match rather than defaulting to 40 ft. Layout arithmetic for a uniform skip pattern, and nothing else. Marking patterns, stripe and gap lengths, widths and colours are set by the MUTCD and by the agency's own standard drawings and vary by marking type and road class: a lane line, a centre line, an edge line and a dotted extension through an intersection are different patterns with different rules, and this does not choose among them. It does not lay out no-passing zones, arrows, symbols or transverse markings, and it does not compute material quantity -- that takes the painted length produced here, the stripe width and the coverage rate, and it is a separate calculation. Retroreflectivity, bead application, surface preparation, temperature and moisture limits, and the removal of conflicting existing markings are all outside it. The adopted MUTCD and its state supplement, the agency's standard drawings, and the project specification govern.

cycle = stripe length + gap length; stripes per mile = 5,280 / cycle; painted length = stripe count x stripe length; painted fraction = stripe / cycle; inverted for maintenance, cycle in place = measured length / counted stripes.

The MUTCD broken-line cycle convention as standard practice, by name. NO PATTERN IS SHIPPED: stripe and gap lengths, widths and colours are set by the MUTCD and the agency's standard drawings and vary by marking type and road class. Material quantity is a separate calculation that takes the painted length produced here. The adopted MUTCD and its state supplement, the agency's standard drawings, and the project specification govern.

Two divisions on lengths the reader enters; no marking pattern table is reproduced.

Estimate. AHJ and licensed professional govern.

Field names used by the API: stripe_length_ft, gap_length_ft, run_length_ft, start_offset_ft, counted_stripes, counted_length_ft, cycle_length_ft, stripes_in_run, stripes_per_mile, painted_length_ft, painted_fraction_pct, implied_cycle_ft

• A uniform skip pattern only lane, centre, edge and dotted extension lines are different patterns with different rulesthe adopted MUTCD and the agency's standard drawings
• Material quantity is separate it takes the painted length produced here plus width and coveragethe project specification
• No-passing zones, arrows and symbols are not laid out a real striping job includes themthe agency's standard drawings