| Factors | Source |
|---|---|
| Project type | Elbeltagi et al. (2014) [6], Irfan et al. (2011) [7] |
| Contract type | Irfan et al. (2011) [7], El-kholy (2015) [8], WSDOT (2015) [9] |
| Area location | Liu et al. (2010) [10], Williams and Songer (2008) [12] |
| Project location (districts) | Elbeltagi et al. (2014) [6], Gardner et al. (2017) [13], Gransberg et al. (2017) [14], Gardner et al. (2016) [15], Kaleem et al. (2014) [5] |
| Project scope | Elbeltagi et al. (2014) [6], [El-Maaty et al. (2017) [16], Barraza et al. (2017) [17] |
| Project length | Elbeltagi et al. (2014) [6], Liu et al. (2010) [10], Gardner et al. (2017) [13], Naik and Radhika (2015) [18], Mahamid (2011) [19], Mahamid (2017) [20] |
| Site topography (Terrain type) | Mahamid (2017) [20], WSDOT (2015) [9], Gardner et al. (2017) [13], Aziz and Abdelhakam (2016) [21], Gransberg et al. (2017) [14] |
| Project capacity (Number of lanes) | Elbeltagi et al. (2014) [6], Attal (2010) [11] |
| Design AADT | Williams and Songer (2008) [12], Attal (2010) [11], Gransberg et al. (2017) [14] |
| Design speed | Williams and Songer (2008) [12], Attal (2010) [11], Gransberg et al. (2017) [14] |
| Geometric design standard | Williams and Songer (2008) [12], Attal (2010) [11], Gransberg et al. (2017) [14] |
| Curb, gutter and sidewalk | Gransberg et al. (2017) [14], Williams and Songer (2008) [12] |
| Waterbody and storm drain extents | Elbeltagi et al. (2014) [6], Gardner et al. (2017) [13] |
| Right-of-way (ROW) costs | Gransberg et al. (2017) [14], Aleithawe et al. (2012) [22] |
| Climate / weather conditions | Rivera et al. (2017) [2], Akal et al. (2017) [23], [Barraza et al. (2017) [17], Ren et al. (2008) [24], Bagaya and Song (2016) [25] |
| Condition / type of soils | Elbeltagi et al. (2014) [6], Gardner et al. (2017) [13] |
| Contractor’s performance | Santoso and Soeng (2016) [26], WSDOT (2015) [9], Doloi et al. (2012) [27], Sambasivan and Soon (2007) [28] |
| Construction letting date | Gransberg et al. (2017) [14] |
| Financial condition and rate of inflation | Akal et al. (2017) [23] |
| Construction project cost/amount | Attal (2010) [11], Naik and Radhika (2015) [18] |