When my parents came back from overseas in April I was spotting to watch their arrival. They messaged me they'd arrived once they cleared customs, I drove over to the carpark. Called them once I'd parked up and got them to meet me halfway. Met them, validated the ticket (maybe 5-7 mins?) and we were off.
Worked really well, and I'll do it that way again in future too
Sarah's way will work just as well
Dan