LIMITATION:
CORRIDOR SPECIFIC

Relies on segment selection: uniform AADT and trip making characteristics
Overestimates existing utilization on low-capacity corridors

Examines demand in aggregate, not at specific sites
Does not account for quality of parking and amenities on a corridor

LIMITATION:
CROWD SOURCED VALIDATION

Potentially excludes illegal / shoulder utilization for corridors with low existing capacity
Relies on high crowd participation on high volume corridors

IMPROVEMENT:
GPS-LEVEL VALIDATION

Exact space counts
Year-round: true seasonal patterns

Reveals illegal / shoulder parking
Enables segment-specific calibration