[4] A vestigial portion of Mount Barker Road exists through the "Old Toll Gate" at Glen Osmond, but has completely subsumed into the South Eastern Freeway as far as the Devil's Elbow, where a surviving western alignment of the road turns a sharp hairpin and has a winding uphill through Eagle On The Hill and rejoins South Eastern Freeway near Measday's Hill in Crafers West.

[9] In 1841 a special Act "... for the making, and maintaining the Great Eastern Road" was passed, and construction of the first section from Glen Osmond to Crafers begun at public expense.

As this was the only route to and from the burgeoning agricultural districts around Mount Barker, not to mention all road traffic to the eastern colonies, this had all the hallmarks of a great money-maker.

A toll gate and accommodation for the gate-keeper were erected and one Samuel Selby appointed keeper of the toll-bar, which was to be staffed 24 hours, seven days a week.

The company failed to reap the rewards anticipated, partly on account of the increased cost of labour as a result of the exodus of able-bodied men to the Victorian goldfields.