An Open Access Journal
Table 1 HDV and CAV parameters
Parameter | Description | Human-driven vehicle | 1st generation CAV | 2nd generation CAV |
|---|---|---|---|---|
Reaction time in car following (reaction time) (s) | It is related to the time gap that elapses between rear end of the lead vehicle and front bumper of following vehicle | 0.8 s | 0.9 s | 0.4 s |
Max. acceleration (m/s2) | Maximum acceleration that a vehicle can achieve under any circumstances | 5 (3, 0.2, 7) Mean (min, dev, max) | 4.5 (3.5, 0.1, 5.5) Mean (min, dev, max) | 3.5 (2.5, 0.1, 4.5) Mean (min, dev, max) |
Normal deceleration (m/s2) | Maximum deceleration a vehicle can use under normal conditions | 3.4 (2.4, 0.25, 4.4) Mean (min, dev, max) | 4 (3.5, 0.13, 4.5) Mean (min, dev, max) | 3 (2.5, 0.13, 3.5) Mean (min, dev, max) |
Max. deceleration (m/s2) | Maximum deceleration a vehicle can use under special circumstances, such as emergency braking | 5 (4.0, 0.5, 6.0) Mean (min, dev, max) | 7 (6.5, 0.25, 7.5) Mean (min, dev, max) | 9 (8.5, 0.25, 9.5) Mean (min, dev, max) |
Clearance (m) | The distance a vehicle keeps between itself and the leading vehicle when stopped | 1 (0.5, 0.3, 1.5) Mean (min, dev, max) | 1 (0.8, 0.1, 1.2) Mean (min, dev, max) | 1 (0.8, 0.1, 1.2) Mean (min, dev, max) |
Safety margin factor | It generates give-way behaviour at unsignalised junctions. The higher the value indicated more cautious behaviour | 1 | [1;1.25] | [0.75;1] |
Look ahead distance factor (anticipation of lane change) | It determines where the vehicles consider their lane change | [0.8;1.2] | [1.1;1.3] | [1;1.25] |
Overtaking | It controls overtaking manoeuvres when a vehicle changes lanes to pass another | Begin at 90%, Fall back at 95% | Begin at 90%, Fall back at 95% | Begin at 85%, Fall back at 95% |