Table 1 Previously developed regression-based operating speed models
Author (s) | Model | R2 | Eq. |
|---|---|---|---|
Two-lane two-way highways | |||
Lamm et al. [2] | \({V}_{85 C}=34.70-1.00 DC+2.081 LW+0.174 SW+0.0004 AADT\) | 0.842 | 1 |
Krammes et al. [3] | \(\begin{array}{c}{V}_{85 C}=102.45-1.57DC+0.0037 Lc-0.1 \Delta \\ {V}_{85 C}=41.62-1.29 DC + 0.0049 Lc-0.12 \Delta + 0.95 V85T\end{array}\) | 0.82 0.9 | 2 3 |
Voigt [4] | \(\begin{array}{c}{V}_{85}=102 - 2.08 DC + 40.33 e\\ {V}_{85 C}=99.6-1.69 DC + 0.014 L - 0.13 \Delta + 71.82 e\end{array}\) | 0.81 0.84 | 4 5 |
Gong and Stamatiadis [5] | For inside lane: \({V}_{85 IL}=51.520 + 1.567 ST - 2.795 MT- 4.001 PT - 2.15 AG + 2.22 ln (LC)\) For outside lane \({V}_{85 OL}=60.779 + 1.804 ST - 2.521 MT -1.071 AG - 1.519 FC + 0.00047 R+ 2.408 \frac{LC}{R}\) | 0.647 0.432 | 6 7 |
Zuriaga et al. [6] | For all radii values: \({V}_{85 C}=97.4254-\frac{3310.94}{R}\) \({V}_{85 C}=\frac{1}{0.00948323+(0.00001501*CCR)}\) For radii > 400 m \({V}_{85 C}=102.048-\frac{3990.26}{R}\) For Tangents \({V}_{85 T}={V}_{85 C}+\left(1-{e}^{-\lambda L}\right)\times ({V}_{des}-{V}_{85C}\)) | 0.76 0.79 0.84 0.52 | 8 9 10 11 |
Passetti and Fambro [7] | \({V}_{85 C}=103.9 - 3020.5/R\) | 0.68 | 12 |
Abbas et al. [8] | \({V}_{85 MC}=75.344-\frac{368.14}{\sqrt{R}}+0.307 {V}_{85 AT}\) | 0.532 | 13 |
Mahmoud et al. [9] | Two-dimensional model: \({V}_{85 C}=102.466-\frac{5003.426}{R}\) Three-dimensional model: \({V}_{85 C}=103.559-\frac{4951.51}{R}-{3012.795 G}^{2}\) | 0.69 0.732 | 14 15 |
Islam and Seneviratne [10] | \({V}_{85 PC}=95.41 - 1.48 DC - 0.012 {DC}^{2}\) \({V}_{85 MC}=103.3 - 2.41 DC - 0.029 {DC}^{2}\) \({V}_{85 PT}=96.11 - 1.07 DC\) | 0.99 0.98 0.98 | 16 17 18 |
Bird and Hashim [11] | \({V}_{85 C}=119.073-\frac{518.275}{\sqrt{R}}-\frac{125440}{{ATL}^{2}}+\frac{413.181}{{\Delta }^{2}}\) | 0.88 | 19 |
Hashim et al. [12] | For point of curvature: \({V}_{85}=99.885-\frac{3880.21}{R}\) For center of the curve: \({V}_{85}=101.564-3480.88/R\) For point of tangency: \({V}_{85}=101.18-\frac{3969.9}{R}\) For tangents \({V}_{85 T}=84.34+0.593\sqrt{{L}_{T}}\) | 0.704 0.730 0.728 0.851 | 20 21 22 23 |
Arterials | |||
Fitzpatrick et al. [13] | For all roadways \({V}_{85 c}=7.675 + 0.98 PSL\) For urban/suburban arterials \({V}_{85 c}=8.666 + 0.963 PSL\) For rural arterials \({V}_{85}=36.453 + 0.517 PSL\) | 0.904 0.86 0.81 | 24 25 26 |
Fitzpatrick et al. [14] | \({V}_{85 c}=43.5+0.38 IDS\) \({V}_{85 T}=74.91+22.29/AD\) | 0.83 0.71 | 27 28 |
Wang et al. [15] | \({V}_{85 T}=31.565 + 6.491 lane.num-0.101 roadside - 0.051 driveway - 0.082 intersection + 3.01 curb - 4.265 sidewalk - 3.189 parking + 3.312 land.use1 + 3.273 land.use2\) | 0.67 | 29 |