Bus Data

A diagram of the MHN is shown below, with data unrelated to buses grayed out.

Nodes and Links

As a refresher, the primary key🔑 for nodes is NODE, while the primary key🔑 for links is ABB. See Highway Data for more information.

Bus Runs (Polyline Feature Classes)

There are 3 bus run feature classes- base, present, and future. The bus runs are defined by their CMAP unique bus run ID (Lowercase mode + 5-digit number, starting at 00000 for base, 50000 for current, and 99000 for future).

The fields in the following table are present for all 3 bus run feature classes.

#	NAME	TYPE	LENGTH	DOMAIN	NOTE
1	TRANSIT_LINE🔑	TEXT	6		CMAP unique bus run ID
2	DESCRIPTION	TEXT	50		Description of bus route
3	MODE	TEXT	1	BUSMODE	Bus mode code
4	VEHICLE_TYPE	TEXT	2	CTVEH	Bus vehicle type code
5	HEADWAY	SHORT		POSITIVE	Headway (minutes) - see note below table
6	SPEED	SHORT		POSITIVE	Average speed (mph)

Note: for base/current runs, HEADWAY describes the length of the TOD period that the run falls into. For example, if it's TOD 1 (8 PM - 6 AM), then the headway is 10 hours, or 600 minutes. The actual headway (duration of time between buses) is calculated later. However, for future runs, HEADWAY describes the actual headway during AM/PM peak time periods.

These fields are specific to bus base/current and are derived from GTFS input:

#	NAME	TYPE	LENGTH	DOMAIN	NOTE
7	ROUTE_ID	TEXT	5		Actual CTA/Pace route number
8	LONGNAME	TEXT	50		CTA/Pace route name
9	DIRECTION	TEXT	5		Direction of travel
10	TERMINAL	TEXT	50		Name of bus destination
11	START	LONG			Start time (seconds after midnight)
12	STARTHOUR	SHORT		HOUR	Hour of the day in which the run begins (0-23)
13	AM_SHARE	DOUBLE			Proportion of run falling within the AM peak period (7 AM - 9 AM)
14	FEEDLINE	TEXT	20		Unique ID based on raw GTFS data