NEMA NTCIP 1204-1998 National Transportation Communications for ITS Protocol - Object Definitions for Environmental Sensor Stations (ESS) (v01.13; Includes Jointly Approved NTCIP 1204 Amendment 1 v02)
2009NEMA NTCIP 1204-2009 National Transportation Communications for ITS Protocol - Environmental Sensor Station (ESS) Interface Protocol (Version 03; Includes Errata 9/2014)
2008NEMA NTCIP 1204-2008 National Transportation Communications for ITS Protocol - Object Definitions for Environmental Sensor Stations v02 (Version 02.24)
2001NEMA NTCIP 1204-2001 National Transportation Communications for ITS Protocol - Object Definitions for Environmental Sensor Stations (ESS) v01.13; Includes Jointly Approved NTCIP 1204 Amendment 1 v02
1998NEMA NTCIP 1204-1998 National Transportation Communications for ITS Protocol - Object Definitions for Environmental Sensor Stations (ESS) (v01.13; Includes Jointly Approved NTCIP 1204 Amendment 1 v02)