"There was even somebody trying to back a caravan up the slip road, " she said.
The crash happened on the westbound exit slip road at junction 16 at about 19:30 GMT on Thursday.
Justine Greening MP agreed saying the alternative of an extra slip road off the A40 should be investigated.
Changes include adding a lane on a slip road at Stivichall Junction and moving slip roads at Tollbar End.
The stations will have direct slip road access on and off both motorways.
Ricky Burlton, 20, from Enfield, died in the crash early on 4 June on the A10 exit slip road at Hoddesdon.
Ms Digby said that at the height of the delays, drivers were reversing back up the slip road on to the motorway.
The A11 southbound exit slip road to the A14 has also re-opened.
Scotland Transerv said an "unforeseen problem" during the construction of the slip road had led to the lane not being reopened as planned.
John Philpotts, prosecuting, said Bather then drove through a no-entry area along a slip road and went down the wrong side of a dual carriageway.
BBC: Connor Carl Bather sentenced for driving 'like a maniac'
That may not be surprising, but the model also shows that the length of a slip road is decisive in determining what happens to traffic.
Earlier this month, work on the Stadium Road slip road caused major disruption for travellers headed for Inverness from the other side of the Kessock Bridge.
And the congestion created by the blip could take hours to settle down, even after the traffic flow on the slip road and the motorway had decreased significantly.
That means looking for the best way to avoid the fatal blips in the slip-road traffic flow, and also finding out how to correct the consequences quickly if a blip does nevertheless slip through.
Temporarily holding back some of the slip-road traffic, for instance, seems to make the journey quicker for everyone in the end.
Each car starts with a certain position and speed, and the road thus has a particular density of cars that changes as they move along, and as new cars are injected from a junction slip-road.
Even the most promising young companies, on the road to going public, have to slip their hands into someone elses pockets.
More importantly, it's a potential lifeline for an Illini team that still has to face No. 18 Minnesota on the road Sunday and had been watching its season slip away.
Hamilton saw the title slip through his fingers at Interlagos last season when he ran off the road trying to pass his then McLaren team-mate Fernando Alonso on the first lap.
And, clearly angered at missing just 10 short of a century, Parnell then bowled with hostility down the Nackington Road slope, accounting for Rees in his third over to a sharp slip catch by Hockley.
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