Trade-Off Considerations in Highway Geometric Design (2011) / Chapter Skim
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49 CHAPTER THREE AGENCY EXPERIENCE formalized process does exist, it is rooted in the conventional design exception process. At the other end of the spectrum, Missouri Department of Transportation (MoDOT)
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50 • Public Information Officer. Typically not involved in design trade-off decisions, but communicates decisions once made.
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51 Next, the agencies were asked to detail the methodology typically used to measure the listed trade-off. The responses have been synthesized to represent the most common received.
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52 • A risk would be considered unacceptable if there is a significant impact to safety considerations. • Reducing safety to deliver a project within the programmed cost is unacceptable.
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53 • MD5 Leonardtown – Heavy movement of horse and buggy on mainline of state highway. Revised typical section of roadway to accommodate horse and buggy safely with cars.
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54 A previous survey conducted in 2002 as part of NCHRP Synthesis 316: Design Exception Practices (22) also determined the number of design exceptions processed in a typical year.
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55 lane width (average 6.2) also had high likelihood of design exception acceptance.
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