Are you heading out of town via the B1228 to Elvington? That was my commute route this morning and it was even more hideous than is usual on a school day due to large numbers of out of area drivers and a bus going in each direction every 5 minutes or so - all because of the
uni open day which it appears is being repeated tomorrow.
It's normally not a bad route on a weekend, but will be unusually busy tomorrow. The stretch from Grimston Bar roundabout to the airfield is going to be the busy bit and is only about 3 miles. There's one particularly unpleasant series of blind bends that I heartily recommend taking a very assertive primary on - drivers will squeeze by otherwise and there's absolutely nowhere to go when they realise there's an oncoming vehicle.
I was vaguely surprised that DZ routed the Cleethorpes (which went on the following year to become the Hull) ride that way the first year as I'd only ever ridden it as a commute at commuting times - it was a bit of revelation on the recce run to discover that on weekends it was merely a bit dull (in daylight) for the first few miles, rather than mildly terrifying!