Mayfly - IRIS Traffic Data

Mayfly - Traffic Data Archive

This site is for the distribution of traffic data collected by the IRIS traffic management system.

Path	Response Body
/mayfly/districts	List of districts in the archive
/mayfly/years	List of years with traffic data
/mayfly/dates	List of dates with traffic data in a year
/mayfly/corridors	List of corridors configured on a given date
/mayfly/nodes	List of nodes on a corridor on a given date
/mayfly/detectors	List of detectors with traffic data on a given date
/mayfly/counts	Vehicle count data for one detector on a given date
/mayfly/speed	Speed data (mph) for one detector on a given date
/mayfly/headway	Headway data (ms) for one detector on a given date
/mayfly/occupancy	Occupancy data (%) for one detector on a given date
/mayfly/length	Length data (ft) for one detector on a given date

All response bodies are JSON arrays.

Path	/mayfly/districts
Query Params	N/A
Example URI	/mayfly/districts

Path	/mayfly/years
Query Params	district	default tms
Example URI	/mayfly/years?district=d3

Path	/mayfly/dates
Query Params	district	default tms
Query Params	year	4 digits
Example URI	/mayfly/dates?year=2021

Path	/mayfly/corridors
Query Params	district	default tms
Query Params	date	8 digits yyyyMMdd
Example URI	/mayfly/corridors?date=20210109

Path	/mayfly/nodes
Query Params	district	default tms
	date	8 digits yyyyMMdd
	corridor	identifier
Example URI	/mayfly/nodes?date=20210415&corridor=94_EB

Path	/mayfly/detectors
Query Params	district	default tms
Query Params	date	8 digits yyyyMMdd
Example URI	/mayfly/detectors?date=20210314

Path	/mayfly/counts
Query Params	district	default tms
	date	8 digits yyyyMMdd
	detector	identifier
	Example URI	/mayfly/counts?date=20210225&detector=363

Path	/mayfly/speed
Query Params	district	default tms
	date	8 digits yyyyMMdd
	detector	identifier
	Example URI	/mayfly/speed?date=20210225&detector=363

Path	/mayfly/headway
Query Params	district	default tms
	date	8 digits yyyyMMdd
	detector	identifier
	Example URI	/mayfly/headway?date=20210225&detector=363

Path	/mayfly/occupancy
Query Params	district	default tms
	date	8 digits yyyyMMdd
	detector	identifier
	Example URI	/mayfly/occupancy?date=20210225&detector=363

Path	/mayfly/length
Query Params	district	default tms
	date	8 digits yyyyMMdd
	detector	identifier
	Example URI	/mayfly/length?date=20210225&detector=363

Additional query filter parameters are available for the following paths:

/mayfly/counts
/mayfly/speed
/mayfly/headway
/mayfly/occupancy
/mayfly/length

Query Params	length_ft_min	Minimum vehicle length filter
	length_ft_max	Maximum vehicle length filter (non-inclusive)
	speed_mph_min	Minimum vehicle speed filter
	speed_mph_max	Maximum vehicle speed filter (non-inclusive)
	headway_sec_min	Minimum headway filter
	headway_sec_max	Maximum headway filter (non-inclusive)

These can be used, for example, for vehicle classification. Adding length_ft_min=7&length_ft_max=19 to a query will return data for vehicles in that length range.