
Total Traffic Volume & Performance in Howard County, Maryland
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day8,078 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 7.3% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 31.5 min |
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Congestion ratio The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network. | 18.7% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 44.3 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $156,139 |
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A typical monitored road in Howard County, Maryland sees 8,078 vehicles per day, while its 609 miles of monitored roads together handle 9,629,640 vehicle-miles traveled per day (≈3.5 billion per year). About 1 in 14 vehicles is a truck, in line with Maryland (7.5%).
Shorter trips than 83% of counties in Maryland
At 8,078 vehicles per day, the average road in Howard tracks closely with the state average of 7,693 vehicles per day. Network-wide, Howard accounts for about 7.0% of Maryland's statewide total of vehicle-miles. Howard carries more traffic than 78% of counties in Maryland.
The average trip takes 31.5 minutes, 7% lower than the state level. Its average travel time of 31.5 minutes is shorter than 83% of counties in Maryland.
The congestion ratio of 18.7% runs slightly lower than the state level (9% lower).
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Howard County, Maryland
| Traffic | vehicles per day38,516 |
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| Trucks | 8.6% |
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| Average travel time | 41.9 min |
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| Congestion ratio | 61.0% |
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| Drivers’ average age | 44.0 yrs |
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| Drivers’ average income | $150,234 |
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A little more than half of the driving in Howard County, Maryland happens on highways: 67% of all vehicle-miles. The average highway carries 38,516 vehicles per day, 469% more than the average non-highway road in the same area, which carries 6,772 vehicles per day.
With 26% of the road miles (160 miles in 644 segments), highways punch above their length, carrying 6,459,671 vehicle-miles traveled per day (≈2.4 billion per year).
That puts Howard among the top 5 counties in Maryland for highway travel volume.
More highway trucks than 87% of counties in Maryland
At 8.6%, highway truck share is 12% lower than the state average. The highway traffic mix is typical for Maryland: neither freight- nor commuter-dominated.
By truck concentration, highways here trail 63% of counties in Maryland. 87% of counties in Maryland see fewer highway trucks per day than Howard's roughly 3,305.

Non-highway Traffic in Howard County, Maryland
| Traffic | vehicles per day6,772 |
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| Trucks | 4.6% |
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| Average travel time | 31.1 min |
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| Congestion ratio | 16.9% |
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| Drivers’ average age | 44.8 yrs |
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| Drivers’ average income | $163,235 |
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Local roads carry a significant share of travel in Howard County, Maryland: 33% of all vehicle-miles. On the average non-highway road, that comes to 6,772 vehicles per day.
Spread over 449 miles and 15,006 segments, 74% of the road network, local roads carry a lighter load per mile: 3,169,968 vehicle-miles traveled per day (≈1.2 billion per year). About 1 in 22 vehicles on non-highway roads is a truck (4.6%).
The highest driver income of any county in Maryland
Compared to highways, non-highway routes see 47% fewer trucks by share.
Non-highway congestion (16.9%) runs slightly lower than the state level (11% lower).
At $156,139, the average driver income for trips originating here is the highest in Maryland. 96% of counties in Maryland have an older driver population than Howard.