Table 2.
Vehicle modelling parameters of Aimsun Next for the study roundabouts. Own research based on the default data presented in [25].
| Model Parameters | Default Values | Fine-Tuned Values | ||||
|---|---|---|---|---|---|---|
| Mean | Dev | Min | Max | HDVs | CAVs | |
| Max desired speed [km/h] | 110 | 10 | 80 | 150 | 50 1 | 50 1 |
| Vehicle length [m] | 4.00 | 0.50 | 3.50 | 4.50 | 4.00 | 4.00 |
| Vehicle width [m] | 2.00 | 0.00 | 2.00 | 2.00 | 2.00 | 2.00 |
| Clearance [m] | 1.00 | 0.30 | 0.50 | 1.50 | 1.00 | 1.00 |
| Lateral clearance [m] | 0.10 | 0.30 | 0.10 | 0.10 | 0.50 | 0.50 |
| Reaction time 2 [s] | 0.80 | - | 0.80 | 0.80 | 0.86 (0.95) 3 | 0.63 |
| Gap [s] | 0.00 | 0.00 | 0.00 | 0.00 | 1.58 (1.33) 3 | 0.00 |
| Speed limit acceptance | 1.10 | 0.10 | 0.90 | 1.30 | 1.00 (0.97) 3 | 1.00 |
| Maximum acceleration [m/s2] | 3.00 | 0.20 | 2.60 | 3.40 | 4.00 | 4.00 |
| Normal deceleration [m/s2] | 4.00 | 0.25 | 3.50 | 4.50 | 4.00 | 4.00 |
| Maximum deceleration [m/s2] | 6.00 | 0.50 | 5.00 | 7.00 | 6.00 | 6.00 |
| Safety Margin Factor | 1.00 | 0.00 | 1.00 | 1.00 | 1.00 | 0.50 |
| Sensitivity Factor | 1.00 | 0.00 | 1.00 | 1.00 | na 4 | 1.00 (0.60) 3 |
| Cooperate in creating a gap 5 | - | - | - | - | na 4 | 0.50 7 |
| Imprudent lane-changing 6 | - | - | - | - | na 4 | yes 7 |
| Headway aggressiveness | 0.00 | 0.00 | −1.00 | 1.00 | na 4 | 0.00 |
1 The value corresponds to the actual limit imposed on the examined roundabouts; 2 value without deviation so that minimum and maximum values are constant values; 3 the values within round brackets concern the two-lane roundabouts; 4 na stands for not applicable; 5 this parameter denotes the percentage of upstream vehicles cooperating to create a gap for a vehicle that tries to change lane, and it can be flagged or not; 6 this parameter defines whether a CAV will still change lane after assessing an unsafe gap and it can be flagged or not; 7 this parameter was flagged just for the two-lane roundabouts.