The Direct Drive Marker specification covers the minimum material, mechanical and performance requirements of New Direction Manufacturing, Inc. These products may be used as daytime and nighttime delineation for survey, right of way, or other marking applications requiring outdoor durability, lightweight, impact and vandal resistance.
2 GENERAL REQUIREMENTS
The Direct Drive Marker shall be a single piece marker capable of simple, permanent installation by one person using a manual or pneumatic driving tool. The marker upon proper installation shall resist displacement from wind and vehicle impact forces. The DM Series shall allow sheeting application and provide structural rigidity. The Marker shall be pointed for ease of ground penetration.
The above delineator shall be UV stabilized, color-impregnated co-polymer for long life expectancy.
The delineator shall exhibit excellent workmanship and shall be free from burns, discoloration, contamination, and other objectionable marks or defects that affect appearance or serviceability.
A black line shall be stamped horizontally across the front of the marker near the bottom to indicate proper burial depth.
3 PHYSICAL AND MECHANICAL REQUIREMENTS
The Direct Drive Marker shall conform to the shape and overall dimensions shown in figure 1.
The nominal Direct Drive Marker width shall be 3.25″ in order to accommodate a 3″ inch wide decal and provide adequate daytime delineation.
The marker shall be of such length to provide the required height above the road surface with a minimum embedment of 18 inches.
3.2 MECHANICAL PROPERTIES
The Direct Drive Marker shall have the minimum mechanical properties as follows.
PROPERTY VALUE ASTM TEST METHOD MINIMUM
Ultimate Tensile Strength D-638 50,000 psi
Ultimate Compressive Strength D-638 45,000 psi
Specific Gravity D-792 1.7
3.3 COLOR FASTENESS
The Direct Drive Marker shall be pigmented throughout the entire cross-section so as to produce a solid color which is an integral part of the material. Ultra-violet resistant materials shall be incorporated in the construction to inhibit fading or cracking of the marker upon field exposure.
Deflection tests shall consist of a two-pound load suspended from one end of the Direct Drive Marker while the other end is clamped to a support in cantilevered fashion. Horizontally, distance from the fulcrum to the weight shall be 48″. The maximum allowable free deflection shall be four inches.
3.5 COLD IMPACT RESISTANT
The Direct Drive Marker shall be conditioned a minimum of two hours at -40°F ± 3°F. A minimum of two-pound spherical weight shall be dropped a distance of five feet through a virtually frictionless vertical guide to impact the surface of the marker at midsection. The surface of the post being struck by the steel ball shall be in a horizontal position with the marker supported and held in position at both ends. The marker shall be subjected to five impact tests concentrated near the middle of the marker within ten minutes from the removal from the environmental chamber. Fracturing, cracking, or splitting of the posts shall constitute failure.
Another marker conditioning shall be struck flush against a flat surface three times within two minutes after removal from the conditioning chamber. To strike the delineator it should be manually swung through a 90° arc and the marker shall not fracture or shatter upon impact.
3.6 VEHICLE IMPACTS
The Direct Drive Marker shall be capable of self-erecting and remain functional after being subjected to an impact by a typical passenger sedan at 35 M.P.H. without substantially damaging the vehicle.
The decals shall be of impact resistant, pressure sensitive sheeting which shall be subject to approval by ordering agency.