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93 Section 6. Project Summary and Future Research Needs The design speed concept has been the centerpiece of AASHTO's geometric design policy since the 1930s.
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From page 94... ...
94 40 mph, and ramp design speeds less than 30 mph should not be used. Similarly, text in the Green Book indicates that the minimum ramp design speed for direct connections preferably should be 40 mph.
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From page 95... ...
95 Finally, throughout this project, several research needs were identified, namely: • Green Book Table 10-4, which provides guide values for minimum acceleration lengths, was adapted (see Table 30)
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