Gregory Highway Resources

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Review our highway resources to learn more about our roadside safety products. It is our mission to answer your questions, solve your problems and support your business needs any way we can. Don’t hesitate to contact the Gregory Highway team if you want to know more about our people, products or processes.

Gregory Highway Safety Catalog

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Video Resources

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MASH TL-4 Roller Barrier - Pick Up Test

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MSKT MASH SKT Informational Video

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Guardrail

Stamping Codes

Stamping Codes Chart

  1. Manufacturer (GH = Gregory Highway)
  2. AASHTO Specifications
  3. Class: Class A = 12 ga, Class B = 10 ga
  4. Type:
    1. Type 1 = Zinc coated 1.8 oz/ft2 (550 g/m2) min single spot
    2. Type 2 = Zinc coated 3.6 oz/ft2 (1100 g/m2) min single spot
    3. Type 3 = Uncoated Steel
    4. Type 4 = Weathering Steel
  5. Mill Heat Number
  6. Operator identification (A-Z)
  7. Galvanized Lot: 09 = Week (9th week), 17 = Year (2017)
Stamping Codes Schematic

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Convex and Concave Curved Guardrail Panels

Convex and Concave Guardrail

Guardrail sections to be installed on curves with a radius of 5 ft. to 150 ft. can be curved in our fabricating facilities. Terms convex or concave refer to the inward or outward curve relative to the traffic face of the guardrail.

convex and concave guardrail

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Finding the radius for a curved guardrail:

Step 1

Starting at the last post in the straight run (point A), lay cloth tape along the path that the curved guardrail will follow.

Step 2

Mark off two points along the curved cloth tape: one at 6 ft. 3 in. (point B), and the second at 12 ft. 6 in. (point C).

Step 3

Pull string directly from starting point (point A) to the second mark-off point (point C).

Step 4

Measure from the first markoff point (point B) over to the midpoint of the taut string. This measurement (D) is the rise.

Step 5

Check the chart to find the radius (R), given the rise (D). Example: a rise of 3 1/8 in. would result in a radius of 60 ft.

RADII ANGLE CHORD HEIGHT / RISE
5 143˚ 14’ 9' 5-7/8" 3’ 5”
10 71˚ 37’ 11’ 8-3/8” 1’ 10-3/4”
15 47˚ 45’ 12’ 1-3/4” 1’ 3-3/8”
20 35˚ 49’ 12’ 3-5/8” 11-5/8”
25 28˚ 39’ 12’ 4-1/2” 9-3/8”
30 23˚ 52’ 12’ 4-7/8” 7-3/4”
35 20˚ 28’ 12’ 5-1/8” 6-5/8”
40 17˚ 53’ 12’ 5-3/8” 5-7/8”
45 15˚ 55’ 12’ 5-1/2” 5-1/4”
50 14˚ 19’ 12’ 5-5/8” 4-5/8”
55 13˚ 01’ 12’ 5-5/8” 4-1/4”
60 11˚ 56’ 12’ 5-3/4” 3-7/8”
65 11˚ 01’ 12’ 5-3/4” 3-5/8”
70 10˚ 14’ 12’ 5-3/4” 3-3/8”
75 9˚ 33’ 12’ 5-3/4” 3-1/8”
80 8˚ 57’ 12’ 5-7/8” 3”
85 8˚ 26’ 12’ 5-7/8” 2-3/4”
90 7˚ 58’ 12’ 5-7/8” 2-5/8”
95 7˚ 32’ 12’ 5-7/8” 2-1/2”
100 7˚ 10’ 12’ 5-7/8” 2-3/8”
110 6˚ 31’ 12’ 5-7/8” 2-1/8”
120 5˚ 58’ 12’ 6” 2”
130 5˚ 31’ 12’ 6” 1-3/4”
140 5˚ 07’ 12’ 6” 1-5/8”
150 4˚ 47’ 12’ 6” 1-1/2”

 

Guardrail Drawings

MFLEAT

MASH Flared Energy Absorbing Terminal

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MFLEAT Drawings

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MFLEAT Installation Manual

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MFLEAT Acceptance Letter

TTMA-200

Trailer Truck Mounted Attenuator

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