California planners say one consequence may be to encourage suburban sprawl as counties permit new development in rural, unincorporated areas to make up lost revenues.
One course could encourage sprawl and pollution; the other would conserve energy, experts say.
These groups argue that increasing the highway's capacity will only increase traffic over the span and encourage suburban sprawl.
How have property taxes encouraged sprawl?
Others see the road as one which will ultimately encourage urban sprawl in an area which is currently mostly undeveloped.
One of the main concerns is whether or not it encourages urban sprawl.
Yet the new clean air regulations could encourage suburban sprawl (and thus more cars), while hurting the development of industrial jobs in the cities.
A handful of other real estate agents in this state have started to turn down listings that encourage sprawl or involve tearing up wildlife habitat.
"We spend tax dollars to encourage sprawl, and then it comes back to us as air pollution."
New freeways encouraged massive suburban sprawl to the north of the city.