How far is the next rest area on the turnpike that has a gas station?
[IN:GET_DISTANCE How far is [SL:DESTINATION [IN:GET_LOCATION the [SL:LOCATION_MODIFIER next ] [SL:CATEGORY_LOCATION rest area ] on [SL:LOCATION_MODIFIER [IN:GET_LOCATION [SL:CATEGORY_LOCATION the turnpike ] ] ] that has a [SL:LOCATION_MODIFIER [IN:GET_LOCATION [SL:CATEGORY_LOCATION gas station ] ] ] ] ] ? ]