Does anyone remember the name of this show from the 1980s?

All I remember is part of the opening. A family driving a hatchback car when a earthquake opens the road and they fall in. I thought it was Land of the lost, but that starts with a river ride, or land of the giants, but that stared in 68, not in the 80s, and I am pretty sure the show I am thinking of starts in a... show more All I remember is part of the opening.
A family driving a hatchback car when a earthquake opens the road and they fall in.

I thought it was Land of the lost, but that starts with a river ride, or land of the giants, but that stared in 68, not in the 80s,
and I am pretty sure the show I am thinking of starts in a hatchback car and was made in the 80's.
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