What are the pros and cons of the current highway funding structure as related the taxes paid by motor carriers?

250 words with reference please: What are the pros and cons of the current highway funding structure as related the taxes paid by motor carriers? How do you think sustainability efforts by Walmart will impact the larger logistics industry? Watch the following video and explain what you think about how this program of companies encouraging their people to be positive role models.

Video:  2010 FedEx Global Citizenship Update