Source: Texas Transport Institute.
- Demographic increase is a straightforward factor as the more people the more potential drivers.
- The increase in trip length as well as the number of trips often relates to suburbanization as people living in suburbs are more likely to have longer trips.
- A decrease in vehicle occupancy is commonly linked with limited opportunities for car pooling and trip chaining.
- In view of limited alternatives or the low convenience of public transit, many will switch to driving.