Party Animal, whatever was this feeble vehicle?
The High Dike slip road is only about 400 ft long, so assuming you were doing about 15 mph on entry, if the wheeze-box had only cracked 40 mph when you joined the A1, that would have given you an average acceleration of only about 3.75ft/sē - meaning if it kept up that stunning rate of acceleration it would take nearly 24 seconds to reach 60 mph. Almost 100E Anglia performance - if that isn't an oxymoron....