road connectors table structure

The Road_Connectors table holds all virtual links necessary to connect the road network to other infrastructure, such as ferry services

To this extent, each road connector must have one extremity (from_node/to_node) set to a node in the network, and the other extremity set to a member (node) if a different table (e.g. transit stop).

Table Structure

Field	Type	NULL allowed	Default Value	Foreign key	Description
road_connector*	INTEGER	NO			Unique identifier of the bidirectional road connector
from_node	INTEGER	NO	0		The node identifier of the “from” node that this link connects to.
to_node	INTEGER	NO	0		The node identifier of the “to” node that this link connects to
length	REAL	NO	0		link length (in meters) - set by POLARIS based on the link geometry
use	TEXT	NO	‘ANY|AUTO|WALK’		If different than ANY, restricts the use of this link to the specified vehicle types
type	TEXT	NO	‘LOCAL’		Default road type for auto access based on purpose
fspd_ab	REAL	YES	0		free flow speed (in m/s) of the unidirectional link from from_node to from_node
fspd_ba	REAL	YES	0		free flow speed (in m/s) of the unidirectional link from to_node to from_node
purpose	TEXT	NO	0		The reason for the existence of this link (e.g. ferry_access)
bearing_a	INTEGER	NO	0		Trigger-added bearing info for link from node a
bearing_b	INTEGER	NO	0		Trigger-added bearing info for link from node b
geo	LINESTRING	NO	‘’

(* - Primary key)

The SQL statement for table and index creation is below.

CREATE TABLE IF NOT EXISTS Road_Connectors(
 road_connector    INTEGER UNIQUE  NOT NULL PRIMARY KEY,
 from_node         INTEGER         NOT NULL DEFAULT 0,
 to_node           INTEGER         NOT NULL DEFAULT 0,
 length            REAL            NOT NULL DEFAULT 0,
 use               TEXT            NOT NULL DEFAULT 'ANY|AUTO|WALK',
 "type"            TEXT            NOT NULL DEFAULT 'LOCAL',
 fspd_ab           REAL                     DEFAULT 0,
 fspd_ba           REAL                     DEFAULT 0,
 purpose           TEXT            NOT NULL DEFAULT 0,
 bearing_a         INTEGER         NOT NULL DEFAULT 0,
 bearing_b         INTEGER         NOT NULL DEFAULT 0
);
UPDATE SQLITE_SEQUENCE SET seq = 5000000 WHERE name = 'Road_Connectors';
SELECT AddGeometryColumn('Road_Connectors', 'geo', SRID_PARAMETER, 'LINESTRING', 'XY', 1);
SELECT CreateSpatialIndex('Road_Connectors', 'geo');