Further definition of the ODEX may be read here: From detailed energy efficiency indicators to an aggregated energy efficiency index called ODEX (http://www.monitoringstelle.at/fileadmin/docs/de/Diverse_Dokumente/Definition_Odex.pdf)
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If getting there by car, instead of by train or bus, be generous and share the space. By taking other people who might have made their journey in a separate car, you're putting one less car on the road.
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