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
`Dark`
`Lane open`	↓
`Use caution`	⇣
`Lane closed ahead`	✕
`Lane closed`	✖
`Merge right`	》
`Merge left`	《
`Must exit right`	⤷
`Must exit left`	⤶
`HOV / HOT`	◊
`Variable speed advisory`	A
`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	notes	shift
🔧 Configure	controller	pin, lcs_type, preset

There are a few different types of LCS:

Dedicated signs over each lane
General purpose DMS over each lane
In-pavement LED striping / marking

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.