The scientists proposed an alternative road running to the south of the park.
Driving this alternative road to the famous red-tinged ruins may take longer, but this road's history stretches back to the curtain opening of civilisation.
Improving public transport is another frequently proposed alternative to road pricing.
Later, on GMTV he suggested free school buses, park and ride schemes and the re-phasing of traffic lights were alternative solutions to solve road congestion.
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Justine Greening MP agreed saying the alternative of an extra slip road off the A40 should be investigated.
But at least they accept, grudgingly, the merit of the Swiss road-rail alternative.
Where there is a change, 9.5% would have access to post office services within one mile by road distance to the nearest alternative branch.
Franchises are a good alternative for some people since they give a road map to run that business.
But these services and Europe's rail and road networks could provide some with alternative means of getting to their destinations.
Maybe it's the grim prospect of a race down the middle of the road that has kept me weighing alternative candidates even now.
He has suggested an alternative site in a field further from the main road.
Hwy 83, the road running through the region, is a scenic alternative to I-19 between Nogales and Tucson.
But he said the "middle-of-the-road audience" may have to choose between Holland and Cullum and alternative attractions at Summer Pops.
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