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Default and calibrated values for car following and lane-change model parameters
| Model parameters | Default value | Calibrated value |
|---|---|---|
| look ahead distance [m] | 0 – 250 | 5 – 100 |
| look back distance [m] | 0 – 150 | 30 – 150 |
| Following distance oscillation [m] | 4 | 1.5 |
| Negative speed difference | −0.35 | −0.3 |
| Positive speed difference | 0.35 | 0.3 |
| Oscillation acceleration [m/s2] | 0.25 | 0.4 |
| Waiting time before diffusion [sec] | 60 | 300 |
The number of vehicles at the roundabout during the highest observed day
| Time Interval [min] | Karrada Kharidge [veh] | Street 62 [veh] | Street 18 [veh] | Mijsr Amanna [veh] | Camp Sarah [veh] | Rasheed Camp [veh] |
|---|---|---|---|---|---|---|
| 8:00 – 8:15 | 294 | 201 | 125 | 419 | 229 | 133 |
| 8:15 – 8:30 | 308 | 185 | 109 | 453 | 178 | 141 |
| 8:30 – 8:45 | 297 | 149 | 137 | 464 | 201 | 133 |
| 8:45 – 9:00 | 345 | 197 | 100 | 448 | 196 | 161 |
| Total | 1244 | 732 | 471 | 1784 | 804 | 568 |
| 9:00 – 9:15 | 334 | 193 | 128 | 412 | 194 | 124 |
| 9:15 – 9:30 | 314 | 181 | 115 | 332 | 203 | 131 |
| 9:30 – 9:45 | 363 | 206 | 116 | 460 | 152 | 148 |
| 9:45 – 10:00 | 330 | 185 | 124 | 419 | 107 | 132 |
| Total | 1341 | 765 | 483 | 1623 | 656 | 535 |
| 13:00 – 13:15 | 181 | 288 | 144 | 313 | 125 | 179 |
| 13:15 – 13-30 | 154 | 266 | 131 | 410 | 85 | 185 |
| 13:30 – 13:45 | 312 | 252 | 132 | 375 | 117 | 172 |
| 13:45– 14:00 | 150 | 283 | 151 | 322 | 124 | 162 |
| Total | 797 | 1089 | 558 | 1420 | 451 | 698 |
| 14:00 – 14:15 | 203 | 227 | 159 | 379 | 120 | 161 |
| 14:15 – 14:30 | 193 | 275 | 136 | 428 | 119 | 151 |
| 14:30 – 14:45 | 136 | 271 | 138 | 294 | 119 | 149 |
| 14:45 – 15:00 | 142 | 255 | 149 | 331 | 122 | 160 |
| Total | 674 | 1028 | 582 | 1432 | 480 | 621 |
Geometric features of the roundabout’s approaches
| Approach | No. of lanes | Approach width [m] |
|---|---|---|
| Karrada Kharidge | 2 | 9 |
| 62 Street | 2 | 9 |
| 18 Street | 2 | 9 |
| Mijsr Amanna | 2 | 9 |
| Camp Sarah | 2 | 9 |
| Rasheed Camp | 2 | 9 |