Recommended Guidelines for Curb and Curb-Barrier Installations (2005) / Chapter Skim
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Pages 25-30
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From page 25... ...
25 CHAPTER 3 SUMMARY OF STATE SURVEYS ON CURBS AND CURB–BARRIER COMBINATIONS INTRODUCTION The objective of this research project was to develop design guidelines for using curbs and curb–barrier combinations on roadways with operating speeds greater than 60 km/h. Seven tasks were identified to accomplish this objective.
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From page 26... ...
State 24 also responded that it did not restrict their use, but its roadside design guide prohibits the use of nonsloped curb on new construction projects on highways with operating speeds greater than or equal to 80 km/h and along the mainline of Interstates, freeways, or high-speed parkways. TYPICAL FUNCTION OF CURBS AASHTO lists drainage control, pavement edge delineation, right-of-way reduction, aesthetics, delineation of pedestrian walkways, reduction of maintenance operations and assistance in orderly roadside development as purposes of 26 curbs.
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From page 27... ...
27 AASHTO curb Number of states using this curb Number of states using a curb similar to this curb Total Type A Vertical 5 3 8 Type B Sloped 6 7 13 Type C Sloped 5 2 7 Type D Sloped 6 1 7 Type E Sloped 3 1 4 Type F Sloped 0 1 1 Type G Sloped 2 3 5 TABLE 5 Vertical and sloped curb use among the states surveyed A1 A2 A3 A4 A5 A6 A7 Figure 19. Curbs used by various states that could not be classified as AASHTO curbs.
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From page 28... ...
Regarding offset distances, four states recommended the curb be placed offset from the barrier, though at distances that varied greatly; one state placed the curb under the barrier; and most states placed the curb face flush with the barrier face. The responses are summarized in Table 6.
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From page 29... ...
One state was interested in design, maintenance, and construction issues concerning curb–barrier combinations. They ID Curb type Barrier type Distance from edge of lane to barrier Distance from face of curb to barrier face 1 A Guardrail 0.6 m 0.15 m 3 A (similar)
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From page 30... ...
had recently sent a questionnaire to all DOTs asking if the surveyed state installed curb in conjunction with strong-post guiderail. If so, the questionnaire inquired about installation, milling and overlay procedures, and whether the surveyed state had experienced any complications with the guiderail and curb combination while milling, installing, snow plowing, or overlaying.
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