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Table 2 Initial values, bounds and optimization results for Gipps’ parameter values
From: Flexible car–following models for mixed traffic and weak lane–discipline conditions
Parameters | Initial values | Constraints | Opt. values | Mean values | |||
|---|---|---|---|---|---|---|---|
Min | Max | Sample 1 | Sample 2 | Sample 3 | |||
α | 0.8 | 0.8 | -2.6 | 0.81 | 0.82 | 0.82 | 0.82 |
b | -3.2 | -5.2 | -1.6 | -5.18 | -5.17 | -5.08 | -5.14 |
V | 14.4 | 10.4 | 29.6 | 10.45 | 10.44 | 10.44 | 10.44 |
s | 5.9 | 5.6 | 7.5 | 5.62 | 5.60 | 5.60 | 5.61 |
b | -3.1 | -4.5 | -3.0 | -3.01 | -3.01 | -3.00 | -3.01 |
RMSN | - | - | - | 0.21 | 0.22 | 0.21 | - |