TMS data

Traffic measurement system data

TMS-stations are composed of data collection units and induction loops embedded in roads. There are more than 450 stations in Finland. The stations contain sensors that produce computational data. The computations use sensor constants whose values are station specific.

Computational sensors

The table below contains additional information about sensors.

  • LIUKUVA = Measurements from the last n minutes
  • KIINTEA = Measurements from the fixed n minutes time window
IdNameUnitDescription
5152
5125
KESKINOPEUS_5MIN_LIUKUVA_SUUNTA1 KESKINOPEUS_5MIN_LIUKUVA_SUUNTA2km/hThe average speed for the last five minutes.
5158
5161
KESKINOPEUS_5MIN_LIUKUVA_SUUNTA1_VVAPAAS1 KESKINOPEUS_5MIN_LIUKUVA_SUUNTA2_VVAPAAS2% of the free flow speedThe average speed percentage of the road free flow speed for last five minutes.
Value descriptions:
0 – 10 Stationary
10 – 25 Queuing
25 – 75 Slow
75 – 90 Platooning
90 – 100 Fluent
5056
5057
KESKINOPEUS_60MIN_KIINTEA_SUUNTA1 KESKINOPEUS_60MIN_KIINTEA_SUUNTA2km/hThe average speed for the given 60 minutes time period.
5058
5061
KESKINOPEUS_5MIN_KIINTEA_SUUNTA1_VVAPAAS1 KESKINOPEUS_5MIN_KIINTEA_SUUNTA2_VVAPAAS2% of the free flow speedThe average speed percentage of the road free flow speed for for the given 5 min time period.
Value descriptions: see above KESKINOPEUS_5MIN_LIUKUVA_SUUNTA1_VVAPAAS1.
5116
5119
OHITUKSET_5MIN_LIUKUVA_SUUNTA1 OHITUKSET_5MIN_LIUKUVA_SUUNTA2kpl/hVehicles passed from the last 5 minutes extrapolated to the one hour. I.e. how many vehicles would pass in an hour if the amount of vehicles would equal the amount of passes during the last five minutes.
5164
5168
OHITUKSET_5MIN_LIUKUVA_SUUNTA1_MS1 OHITUKSET_5MIN_LIUKUVA_SUUNTA2_MS2% of the maximumPercentage of vehicles passed during the last 5 minutes (extrapolated to one hour) from the maximum amount of vehicles per hour (MS1/MS2).
5064
5068
OHITUKSET_5MIN_KIINTEA_SUUNTA1_MS1 OHITUKSET_5MIN_KIINTEA_SUUNTA2_MS2kpl/hPercentage of vehicles passed during the fixed 5 minutes time window from the maximum amount of vehicles per hour (MS1/MS2)
5054
5055
OHITUKSET_60MIN_KIINTEA_SUUNTA1 OHITUKSET_60MIN_KIINTEA_SUUNTA2kpl/hVehicle passes in the fixed 60 minutes time window.
5067
5071
OHITUKSET_60MIN_KIINTEA_SUUNTA1_MS1 OHITUKSET_60MIN_KIINTEA_SUUNTA2_MS2% of the maximumPercentage of vehicles passed during the fixed 60 minutes time window from the maximum amount of vehicles per hour (MS1/MS2).

Sensor constans

The table below contains values for sensor constants used by computational sensors. Note that the constant values vary by station, check the out here: https://tie.digitraffic.fi/api/v1/data/tms-sensor-constants.

ConstantUnitValue rangeDescription
VVAPAAS1
VVAPAAS2
km/h18-107Speed limit for a direction.
MS1
MS2
kpl/h200-3600
200-14000
A lane’s maximum amount of vehicles per hour in an ascending/descending direction.
Tien_suuntaAste (°)0–360°Road direction by degrees in an ascending/descending direction. North 0°, east 90°, etc.
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