Meeting someone at an airport has become a more regulated activity than it used to be. The change follows from a curb that has not grown while the number of vehicles using it has.
The curb is a conveyor, not a parking lot
Arrivals roadways are sized for vehicles stopping briefly. Capacity depends on how quickly each vehicle clears, not on how many could physically fit along the frontage.
A vehicle waiting five minutes occupies space that several vehicles could have used, so a small number of waiting drivers reduces throughput sharply.
Enforcement against stopping is aimed at protecting that flow rather than at inconveniencing anyone, and it tightens as the airport gets busier.
Cell lots move the waiting off the roadway
Free waiting areas away from the terminal exist so a driver can arrive early without occupying the curb, then move forward when the passenger is actually outside.
The design depends on the drive from the lot being short and predictable, which is why these lots sit close to the terminal loop even though they look remote.
Their effectiveness relies on passengers calling only once they have their bags, since a driver summoned early simply moves the wait to the curb.
Ride-hailing changed the arithmetic
Vehicles arriving without an assigned passenger, then circulating while a match is made, add traffic that produces no pickups.
Airports responded with designated zones, staging areas and access charges, which convert an unmanaged flow into a queue that can be measured and controlled.
The zones are often placed at a distance or on a different level precisely because that separates the matching process from the terminal frontage.
Levels separate arrivals from departures
Where a terminal has two roadway levels, the split exists to give each direction its own capacity, since arrival and departure peaks do not coincide.
Experienced travelers sometimes meet drivers on the departures level, which works because that curb is quieter when arrivals are busiest.
Airports vary in whether that is permitted, and signage rather than habit is the reliable guide.
Parking is priced to shape behavior
Short-term garages are usually placed nearest the terminal and priced steeply by the hour, which encourages brief stays and rapid turnover.
For a pickup involving any uncertainty about arrival time, a short stay in that garage often costs less in aggravation than repeated loops of the roadway.
The pricing structure is a traffic management tool as much as a revenue source.