No reason [[other than no funding for either) that we can't have both! Only a fraction will benefit from light rail too. As it is only about 1 percent of the trips in the area are made with transit. Light rail if it is a huge success will be able to bring it to two percent.
If you can harness the solar to recharge the car as it rides on the road, you can toll the road accordingly. Seems like a good zero carbon solution to me.
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