Haydock Park is one of three sites on the M6 where space for a service area was created but never utilised. The access roads are laid out and today it serves as the Northwest Regional Control Centre for the Highways Agency. It is almost exactly half way between the existing services at Charnock Richard and Knutsford.
This site has a 'secret exit'. However, if it were to be built then it would be pretty dangerous, as there is an exit half a mile north of the "services" and two miles south of them. Plus, the south-facing sliproads are very sharp, probably because the motorway is climbing at this point.
The compound (works unit) has been used a manned depot since the construction of M6 and is officially referred to as 'Rob Lane' after the name of the side road passing under the M6 adjacent to the control centre.