"The lovely people of Devon County Council have looked after us very well.
"I didn't imagine there would be snow in March to be perfectly honest with you, but certainly didn't expect to spend our first night in a school college."
The couple said they hoped to make their way to the hotel, where they are booked in for three nights.
The A30 was hit by "significant snow," Devon and Cornwall Police said, with conditions "changing rapidly from passable to impossible".
Some 100km of road between the M5 at Exeter and the A38 at Bodmin were shut as a result while officers and Highways England cleared the route.
Although it was believed the cold snap would be over by the beginning of the week, wintry weather is continuing into today.
The Met Office has issued a yellow weather warning for snow and ice for all of England and Wales, lasting until tonight NZT.
Conditions are expected to brighten later in the week, with temperatures soaring to double figures by Friday.
Richard White, volunteer rest centre manager, said spirits were high among those sheltering in the school, despite their dramatic evening.
He said: "We first of all provide them with something hot to drink and we've got blankets, duvets.
"We make sure people get a good night's sleep, we feed them in the morning and weather-permitting, we prepare them to get back in their cars and on their way.
"Police want everybody off the roads to give them the opportunity to clear the roads with the snow ploughs and the gritters in time for the morning."
Hundreds of schools across the country shut due to the treacherous conditions, while train services were also disrupted, with some disruptions expected to continue on throughout the day.