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| Extreme | Severe | Heavy | Moderate | Free flow |
| Highway |
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|
|
| Avg. daily traffic per lane | >25,000 | 20,001 - 25,000 | 17,501 - 20,000 | 15,001 - 17,500 | <15,000 |
| Avg. vehicle speed (mph) | 32 | 35 | 38 | 45 | 60 |
| Arterial |
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| Avg. daily traffic per lane | >10,000 | 8501 - 10,000 | 7001 - 8500 | 5001 - 7000 | <5500 |
| Avg. vehicle speed (mph) | 21 | 23 | 27 | 30 | 35 |