From the Heathrow publication " Taking Britain Further".
Heathrow East will be what old folk called the CTA, Term's 1,2,& 3. Heathrow West will be an enlarged & extended T5 westwards engulfing the north/south road from Staines to Uxbridge, used by non M25 traffic, and as a major freight & airport services road. Term 4 exists on the plan, but is not named on the "refreshed plan"
