Purpose Trips Distance (miles) Time (minutes)
To work Drive 15 30
From parking to office. Walk 0.2 5
To restaurant for lunch. Walk 0.5 10
From restaurant after lunch. Walk 0.5 10
From office to parking. Walk 0.2 5
To home. Drive 15 30
To commercial center. Bike 1 5
Errands (travel between shops) Walk 0.5 10
Home from shopping center. Bike 1 5
Walk dog. Walk 0.5 10
Drive 2 (40%) 30.0 (87%) 70 (58%)
Walk 6 (40%) 2.4 (7%) 40 (33%)
Bike 2 (20%) 2.0 (6%) 10 (8%)
Totals 10 (100%) 34.4 (100%) 120 (100%)
(Values in parentheses indicate percentage of total travel.)
Example of Daily Person Trips
Consider the daily travel of somebody who commutes by car but walks and bikes for errands, as summarized in the above table. A traffic perspective, which only counts motor vehicle travel, classifies her as an auto-commuter and measures her car mileage. A mobility perspective also counts walking and cycling travel, but since driving represents 87% of mileage, considers nonmotorized modes of little importance. However, an access perspective indicates that driving represents just 58% of her travel time and only 40% of her trips, suggesting a more important role for alternative modes.
Different perspectives give different conclusions as to the best way to improve her transport. A pedestrian shortcut that reduces walking distance from her office to nearby restaurants by 0.2 miles provides only a 1% reduction in travel distance, and so appears to have little value if measured by mileage. But this saves 12% of total travel time, the same time savings provided by a major roadway improvement that increases average traffic speeds from 30 to 38 mph for a 15-mile commute.