Station Interior Impression Change Example - Placement Type

Legacy Methodology

Placement Exposure Update

For inventory inside transit stations, traffic is reduced to circulation by considering field of view with each frame’s placement type. Placement type is the area within a transit station where the frame is located and can be, for example, entrance/exit, concourse, or platform. A concourse is the large open area inside or in front of a transit station, and a platform is an area alongside a railway track providing convenient access to trains.

For each placement type, a variety of sizing metrics are used to determine a “discounting factor” called placement exposure. The following table gives examples of placement exposure factors for various combinations of placement types and sizing metrics.

Placement Type	Count within Station	Placement Exposure
entrance/exit	1	1.00
entrance/exit	2	0.50
entrance/exit	3	0.33
concourse	1	1.00
concourse	2	0.50
concourse	3	0.33
platform	1	0.67
platform	2	0.50
platform	3	0.44

Geopath Preliminary CTA Station Impressions

Platform vs. Concourse Placement Types

Place Name	Placement Type	Total Impressions
35-Bronzeville-IIT Station	Concourse	10,788
35-Bronzeville-IIT Station	Platform	5,845
95th Station	Concourse	74,696
95th Station	Platform	40,471
Adams/Wabash Station	Concourse	73,045
Adams/Wabash Station	Platform	29,682
Addison-Red Station	Concourse	200,323
Addison-Red Station	Platform	108,536
Argyle Station	Concourse	20,589
Argyle Station	Platform	11,155
Ashland-Lake Station	Concourse	16,465
Ashland-Lake Station	Platform	6,691
Belmont Station	Concourse	192,910
Belmont Station	Platform	104,520
Berwyn Station	Concourse	61,141
Berwyn Station	Platform	33,127
Cermak-Chinatown Station	Concourse	24,428
Cermak-Chinatown Station	Platform	13,235
Chicago-Red Station	Concourse	148,275
Chicago-Red Station	Platform	60,252
Clark/ Lake Station	Concourse	203,721
Clark/ Lake Station	Platform	45,991
Diversey Station	Concourse	66,206
Diversey Station	Platform	26,903
Fullerton Station	Concourse	93,447
Fullerton Station	Platform	75,945
Garfield-Green Station	Concourse	5,043
Garfield-Green Station	Platform	2,049
Granville Station	Concourse	25,056
Granville Station	Platform	27,151
Howard Station	Concourse	17,846
Jackson-Blue Station	Concourse	68,154
Jackson-Blue Station	Platform	36,926
Jarvis Station	Concourse	16,717
Jarvis Station	Platform	9,057
Jefferson Park Transit Center Station	Concourse	39,646
Jefferson Park Transit Center Station	Platform	14,320
Kimball Station	Concourse	18,295
Kimball Station	Platform	14,869
Midway Station	Concourse	68,095
Midway Station	Platform	27,671
Morse Station	Concourse	73,576
Morse Station	Platform	39,864
Polk Station	Concourse	14,849
Polk Station	Platform	6,034
Rosemont Station	Concourse	48,082
Rosemont Station	Platform	26,051
Southport Station	Concourse	20,501
Southport Station	Platform	8,331
Thorndale Station	Concourse	41,749
Thorndale Station	Platform	22,620
Washington/Wells Station	Concourse	114,112
Washington/Wells Station	Platform	46,370
Wellington Station	Concourse	48,204
Wellington Station	Platform	19,588