Possible Clues:

• Son, able to travel again, gets vehicle
• Son presently on phone gets transport for Poles?
• Arctic transport
• Son finally getting wheels, but not on this
• Loud winter transport
• Tracked vehicle for winter travel?
• One with skis shuffling elbows in to nick second
• Winter vehicle for nurses finishing at the present time and for those on call
• Today, after end of blizzards, phone for appropriate vehicle?
• Arctic vehicle is blown off-course around second ridge, finally