NASCAR has revealed the technical changes that it hopes will eliminate the tandem drafting that dominated restrictor plate races in 2011. The trend for cars to hook up in pairs started in the non-championship races ahead of the Daytona 500 in February, as advances in engine cooling meant that drivers could run close together without overheating their engines
Source: http://www.iracing.com/inracingnews/nascar-news/nascar/nascar-acts-on-tandem-drafting/
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