Release of effect verification of "Merging Support
Information Provision System" by FOT~ the first FOT of DAY2 System in Japan ~March 16th, 2022⚫

The Government of Japan is working on the automated driving onexpressways with the goal of bringing it to the Level 4 marketization byaround 2025. Also, in the “Public-Private ITS Initiative/Roadmaps”, “Providingthe merging support information on expressways” is positioned as the priority
measure to make the automated driving on expressways more progress.

⚫

The National Institute for Land and Infrastructure Management (NILIM) has
conducted the “Joint Public-Private Research & Development Project for
Cooperative ITS” in order to realize better road traffic by coordinating vehicles
and roads. In the project we have been studying the practical application of
the “Merge Support Information Provision System”.

⚫

In March 2020, we have carried out the field operational test of DAY1 Systemon the Tokyo Metropolitan Expressway. After that we have summarized thetechnical requirements of DAY2 System based on the knowledge obtained in
the FOT and the technical characteristics of the vehicle detection sensor for
DAY2 System.

⚫

In March 2022, we have conducted the FOT at the NILIM test track to verify
the effect of “Merging Support Information Provision System (DAY2 System)”.
We will inform you of the overview and the results of the FOT. For the details,
you can see next pages.

1

Merging Support Services on expressways

01

Merging Support Services on expressways

Vehicle detection sensor
Detects the main lanevehicles

Roadside antenna
Provides the merging vehicle
with the information of the mainlane vehicles

Roadside processing unit
Generates the information
to be provided to themerging vehicle12Merging Support Information Provision System (DAY1/DAY2)
DAY1 System
Roadside antennaVehicle detection
sensor

DAY2 System

Detects the main lane vehicles in a specific crosssection and provides the information at the spot

Roadside antenna

Vehicle detection
sensor

Detects the main lane vehicles in a certain section
and provides the information continuously

23FOT of DAY2 System (Overview)
Vehicle detection sensor
Sensor detection section(126m/209m)

Soft nose

Acceleration lane
(50m/200m)

Main lane vehicles(5 vehicles)

Roadside unit
Roadside antenna

Merging vehicle

Information provision section(120m)

Vehicle detection sensor

Roadside antenna

Roadside unitMerging section* In the FOT, the merging to the main lane is performed by the driver's operation based on the information from DAY2 System.

34

FOT of DAY2 System (Information provision in the merging vehicle)

Displayed the speed and the positionof the main lane vehicles, and thelongest inter-vehicle time among them

0m
65km/h
59km/h3 sec

50m

52km/h
48km/h100m

40km/h200m

45FOT of DAY2 System (Evaluation)
Merging
vehicleMainlanevehicle

Evaluation Item

Evaluation Criteria

Success rate ofmerging

The number of times the merging vehiclecould or could not merge to the main lane by
the end of the acceleration lane

Distance from the start
to the end of themerging

Distance required for the merging vehicle tomerge to the main lane from the accelerationlane

Acceleration

Acceleration or deceleration when themerging vehicle traveled from the connecting
road to the acceleration lane

Angular velocity

Angular velocity when the merging vehicle
traveled in the acceleration lane

Avoidance

Whether or not there is a avoidance of themain lane vehicle before or after the merging
vehicle merges

Deceleration

The amount of deceleration of the main lanevehicle when the merging vehicle merges tothe main lane56

Result of FOT (Success rate of merging)◼ Example of “Failure of merging”

Acceleratio Acceleration lanen lane
(50m)
(200m)◼ TotalWith-merging support

98

1

Without-merging support

72

250 meters

With-merging support

75

Without-merging support

0

65
0%

10Merging vehicle
Main lane vehicle

20% 40% 60% 80% 100%

Success of merging

Failure of merging◼ By the speed of main lane vehicle (Acceleration lane: 50 meters)

Without-merging support

40km/h15050km/h

15070km/h

30090km/h

1500%
20%
40%
60%
80% 100%
Success of merging Failure of merging

Main lane speed

Main lane speed

With-merging support
40km/h15050km/h

15070km/h
90km/h

278

370%
20%
40%
60%
80% 100%
Success of merging Failure of merging

67

Result of FOT (Success rate of merging)◼ With-merging support

Main lane vehicle
Soft nose

Merging vehicle◼ Without-merging support

Soft nose

Merging vehicle

Main lane vehicle78

Result of FOT (Acceleration)< Without-merging support >Direction of travel

80

0.1

60

040-0.1
Merging to main lane

-0.2-2000-1000Distance from soft nose (m)Acceleration (0.5sec)

100

Acceleration (1.0sec)

0.2

200
Speed (km/h)< With-merging support >Acceleration (G)20

Direction of travel

100

Soft nose

80

0.1

60

0-0.2-200

40

Information
provisionsection-0.1

20

Merging to main lane

0-100
Acceleration (0.5sec)

Speed (km/h)

100Soft nose0

Distance from soft nose (m)Acceleration (1.0sec)

100

Speed (km/h)

Acceleration (G)

0.2

200
Speed (km/h)

89Result of FOT (Avoidance)
3050km/h 1

4470km/h 07590km/h 030

Main lane speed

40km/h 00%（N=180） < Without-merging support >

40km/h3050km/h

3070km/h

6090km/h 2

28

Main lane speed< With-merging support >20% 40% 60% 80% 100%
Avoidance
No-avoidance

0%（N=150）

20% 40% 60% 80% 100%
Avoidance
No-avoidance< Pattern 1>
Merging vehicle
Main lane vehicle< Pattern 2>
Merging vehicle Main lane vehicle

910