Alternate Design/Alternate Bid Process for Pavement-Type Selection (2017) / Chapter Skim
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22 CHAPTER FOUR DEPARTMENT OF TRANSPORTATION ALTERNATE DESIGN/ALTERNATE BID PROCUREMENT POLICIES, PROCEDURES, AND PROGRAMS INTRODUCTION The information provided in this chapter is primarily drawn from the survey of state DOTs described in chapter one. It is supplemented by information found in DOT pavement design manuals and procurement documents, as well as the general literature.
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23 tion between the two industries, especially in agencies where a single pavement type is common practice. PCA stated that alternate bidding "gives the contractor a choice to bid on either a concrete or an asphalt option, thereby increasing the number of bidders on each job and enhancing competition" (PCA 2010)
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24 In general, the winning bid in alternate bidding is determined by finding the lowest bid among the set of lowest bids for each pavement-type alternative after adjusting for LCCs, as shown in Equations 1 and 2 (Hallin et al.
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25 FIGURE 4 Expected ADAB impact on cost and pavement program improvements. FIGURE 5 Median years of ADAB experience.
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26 The survey's also found that increased HMA-PCC lane-mile percentages are associated with agency adoption of defined pavement-type selection processes. Of the 13 ADAB practicing agencies that reported their pavement-type shares in lane miles, the four states with no defined pavement-type selection processes had a lower average PCC pavement types (4%)
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27 SURVEY RESULTS FOR AGENCIES NOT PRACTICING ALTERNATE DESIGN/ALTERNATE BID The survey found that 24 of the 40 responding agencies did not use ADAB practices. Of the 22 states that answered the question of whether they have interest in adopting ADAB practices in the future, nine (41%)
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28 COMPARING PRACTICING AND NONPRACTICING AGENCIES The survey results suggest that the agencies that practice ADAB procedures are different from their nonpracticing counterparts in important ways (Figure 11)
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29 use. One plausible explanation for this relationship is that as agencies chose among different pavement types with increasing frequency, the potential utility of alternate bidding in aiding such decisions becomes more tangible and gives agencies higher incentives to practice alternate bidding.
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30 5. The agencies that expect to use alternate bidding on a continuing basis tend to have better defined processes than those that prefer alternate bidding on an ad hoc basis.
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