摘要: |
Currently, heavy-duty diesel trucks dominate intercity goods movement. Among the most appealing attributes of trucks is their inherent flexibility. They use existing infrastructure (the highway system) to reach dispersed and scattered customer and distribution locations. But the flexibility comes at a high cost: infrastructure deterioration, congestion, traffic safety issues, and pollution; The nation's transportation funding mechanism, fuel taxation and the highway trust fund, is showing signs of distress and state departments of transportation are struggling with the over whelming dual burden of highway expansion to meet growing demand while maintaining the aging network that is already in place. |