Page 49

SURFACE TREATMENTS: PAVEMENT MARKINGS

SPRAY CHALK / SPRAY PAINT Typical Dimensions: 15 oz. can may cover up to 600 - 800 linear ft. using a striper, or up to 25 square feet of space. Estimated Cost: $5 - $15 per 15 oz. can Overview: Temporary spray marking chalk that comes in a wide variety of colors.

F Demo (1 day - 1 month) F Pilot (1 month - 1 year) Interim (1 - 5 years) Recommended Applications and Installation ɖBikeways: ɖ Consult the MUTCD and FHWA for exact pavement marking design and dimensions. Markings should be placed in the center of the bike lane. For shared lane markings, position sharrow a minimum of 4 ft. from the curb in areas with no parking, or a minimum of 11 ft. from the curb where curbside parking is present. To get long, consistent straight lines, use an athletic field striper to apply spray chalk (see page 50). May also be used for any / all other types of pavement markings (striping, colored surfaces etc.).

Top: Tactical Urbanism Materials and Design Guide workshop participants apply spray chalk with a homemade stencil in Fayetteville, AR (Street Plans). Bottom: In Burlington, VT (left) and Portsmouth, NH (right) volunteers use city-owned stencils to create bikeway markings with tempera paint and spray chalk (Street Plans). Each material and approach has its own strengths / weaknesses, as noted in the spec sheets that follow.

Tips and Considerations »» Will endure for days, weeks, or even several months, depending on quality of the chalk / paint and the climate / weather conditions during installation and post installation. Without regular precipitation, may require a pressure washer when removal is required. Opt for traffic tape if ease of removal is a true concern. »» If ordered online, rush orders are typically not available because cans are pressurized and must be ground shipped. »» The chalk color pigments will wash away faster on non-porous surfaces like glass or metal, but can be finished and sealed with spray varnish to create longer lasting effects. »» Limit environmental impact by purchasing non-toxic, eco-friendly brands. Potential Sources »» Purchase from local hardware, craft, or athletic supply stores. MATERIALS PALETTE · Surface Treatments · 49

Tactical Urbanist's Guide to Materials and Design v.1.0  

The only materials and design guidance for Tactical Urbanist demonstration, pilot, and interim design projects. Funded by the James L. Knigh...

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