IRIS

Intelligent Roadway Information System

Lane Control Signs (LCS)

Select View ➔ Lane Use ➔ LCS menu item

Lane Control Signs (LCS) are traffic-control devices for displaying downstream lane conditions to motorists. Typically, one sign is mounted over each lane as an array. They can display standard indications:

# Indication Symbol
1 Dark     
2 Lane open  ↓ 
3 Use caution  ⇣ 
4 Lane closed ahead  ✕ 
5 Lane closed  ✖ 
6 Merge right  》
7 Merge left 《 
8 Must exit right  ⤷ 
9 Must exit left  ⤶ 
10 HOV / HOT  ◊ 
11 Variable speed advisory  A 
12 Variable speed limit  L 
API Resources 🕵️
  • iris/lcs_indication (lookup table)
  • iris/lcs_type (lookup table)
  • iris/api/lcs (primary)
  • iris/api/lcs/{name}
Access Primary Secondary
👁️ View name, location, status geo_loc
👉 Operate lock
💡 Manage shift
🔧 Configure controller, notes pin, lcs_type, preset

There are a few different types of LCS:

Setup

The LCS properties form has setup information.

Field Description
Notes administrator notes, possibly including hashtags
LCS Type dedicated sign, DMS, in-pavement
Preset verification camera preset
Shift roadway corridor lane shift

An LCS array must also be associated with a controller, on IO pin 2. For NTCIP, any controller for a DMS in the array is allowed.

LCS States

Each indication that can be displayed on each lane of an LCS array is represented by an LCS state.

API Resources 🕵️
  • iris/api/lcs_state (primary)
  • iris/api/lcs_state/{name}
Access Primary Secondary
👁️ View name, lcs
💡 Manage lane, indication msg_pattern, msg_num
🔧 Configure controller pin

Each state must be assigned to a separate IO pin on a controller. The pin specifies a digital output to activate that state.

For DMS type signs using NTCIP, the pin is not relevant; any number 3+ will work. Instead, message pattern is used to specify the MULTI for the indication. Message number (2-65535) can be used to speed up activation, by caching the message in the controller's message table.

Repository: IRIS