Divided highway (a.k.a. Dual carriageway) is very common in read world. It is when traffic travelling on roadways of opposite directions are separated by a central reservation. In common LRS setup, each direction is modeled as a separate route in the network. However, this often does not happen for the entirety of the route. In such case we have partially divided highway. Below is an example.


There are two data models to model partially divided highway in AgileAssets system. They are explained below.

  • Gaps Mode: In this model, a separate route is built to represent each direction. The cardinal (or primary) direction route (usually East or North Bound) is continuous throughout the entirety of the route, whereas the non-cardinal (or reverse/non-primary) direction route (usually West or South Bound) has gaps when the route is undivided. This step is commonly used for agencies that do not use concurrency in the LRS. An example of this setup is shown: A01-EB is the cardinal direction route, and A01-WB is the non-cardinal direction route.


Under this model, this is what two routes look like (distance between routes is exaggerated for displaying purpose):

The LRS database tables NETWORK_GAPS, CONCURRENT_LOCATION_DOM, CONCURRENT_LOCATION_SIB, NETWORK_LINE_DIRECTIONS and SETUP_LOC_IDENT are filled as follows, to represent the above route network.

NETWORK_LINE_DIRECTIONS


SETUP_LOC_IDENT

LOC_IDENT


LOC_IDENT

ROUTE

LANE_DIR

FROM

TO

LANE_ID

101


601

A01-EB

1

1

10

0

202


602

A01-EB

2

1

2

0

303


603

A01-EB

2

4

6

0

404


604

A01-EB

2

8

10

0

505


605

A01-WB

2

2

4

0

606


606

A01-WB

2

6

8

0










CONCURRENT_LOCATION_DOM








Empty

















CONCURRENT_LOCATION_SUB








Empty

















NETWORK_GAPS


SETUP_LOC_IDENT

LOC_IDENT

ALLOW SPANNING


LOC_IDENT

ROUTE

LANE_DIR

FROM

TO

LANE_ID

701*

0


701

A01-WB

0

1

2

0

702

0


702

A01-WB

0

4

6

0

703*

0


703

A01-WB

0

8

10

0

*NOTE: If it’s the beginning / end of the route, then these gap records are not needed. In other words, if the route starts at Milepoint 1, it is not needed to record milepoint 0 to 1 as a gap. Because that part of the route is automatically considered outside the route. Similarly, if the route ends at milepoint 8, milepoints 8 to 10 don’t need to be recorded as gap.


This setup will result in the following issue when recording line events when the roadways diverge or converge.



  • Concurrency Model: In this model, a separate route is built to represent each direction. Both the cardinal (or primary) direction route and non-cardinal (or reverse/non-primary) direction route are continuous throughout the entirety of the route. At the portion of the roadway where it is undivided, the two routes are concurrent. A dominance rule is normally built into the network when there is concurrency. So, at the undivided portion of the roadway, the cardinal direction route is dominant, and non-cardinal direction route is subordinate.


Under this model, this is what two routes look like (distance between routes is exaggerated for displaying purpose):

The LRS database tables NETWORK_GAPS, CONCURRENT_LOCATION_DOM, CONCURRENT_LOCATION_SIB, NETWORK_LINE_DIRECTIONS and SETUP_LOC_IDENT are filled as follows, to represent the above route network.

NETWORK_LINE_DIRECTIONS


SETUP_LOC_IDENT

LOC_IDENT


LOC_ IDENT

ROUTE

LANE_DIR

FROM

TO

LANE_ID

601


601

A01-EB

1

1

10

0

602


602

A01-EB

2

1

2

0

603


603

A01-EB

2

4

6

0

604


604

A01-EB

2

8

10

0

605


605

A01-WB

2

2

4

0

606


606

A01-WB

2

6

8

0

NOTE: NETWORK_LINE_DIRECTIONS table does not contain subordinate section data.


CONCURRENT_LOCATION_DOM


SETUP_LOC_IDENT

DOM_LOCATION_ID

LOC_IDENT


LOC_IDENT

ROUTE

LANE_DIR

FROM

TO

LANE_ID

501

50101


50101

A01-EB

0

1

2

0

502

50202


50202

A01-EB

0

4

6

0

503

50303


50303

A01-EB

0

8

10

0










CONCURRENT_LOCATION_SUB


SETUP_LOC_IDENT

DOM_LOCATION_ID

LOC_IDENT


LOC_IDENT

ROUTE

LANE_DIR

FROM

TO

LANE_ID

501

50104


50104

A01-WB

0

1

2

0

502

50105


50205

A01-WB

0

4

6

0

503

50106


50306

A01-WB

0

8

10

0










NETWORK_GAPS


 




Empty









This setup will result in the following issue when recording line events when the roadways diverge or converge.

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