PC Mark Dempster of the collision investigation unit told the hearing there was no evidence of ice on the road:
"To move a wagon of this size across the road would require a large piece of ice- in the nine minutes it took the emergency services to arrive that ice would still be visible"
"On the balance of probability as to why Mr McQueen failed to negotiate the left hand kink it is possible he became distracted."
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Kevin Alexander Docherty, 35, and 20-year-old Kyle Jonathan Russell Hill went on trial at Carlisle Crown Court earlier this week.
An 81-year-old woman has had her handbag snatched after falling to the ground and sustaining serious head and facial injuries.
HMICFRS inspected the constabulary as part of a programme involving every police force across England and Wales.