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Motor vehicle carbon emissions under different traffic conditions.
| Traffic condition | Basic free flow | Mild congestion | Moderate congestion | Severe congestion |
|---|---|---|---|---|
| CDI range | [1.0, 1.5) | [1.5, 1.8) | [1.8, 2.2) | [2.2, +∞) |
| Total emissions per 1 km per hour [t·(h·km)−1] | 0.986 | 1.576 | 2.004 | 3.208 |
| Total emissions per hour per kilometer of urban arterial road [t·(h·km)−1] | 0.592 | 0.946 | 1.202 | 1.925 |
