SLIF App

Overview

When running this app, VBOX Touch can efficiently validate Speed Limit Information Function (SLIF) and Intelligent Speed Assist (ISA) systems. The app logs distance data and sign recognition inputs (OK/NOK), and calculates the True Positive Distance (TP_D - percentage of total distance where the displayed speed limit matches the road signs).

Key features include:

Real-time compliance monitoring for displayed speed vs real-world signage (TP_D).
Driving session tracking across urban, inter-urban, and highway conditions, day or night.
Event logging with the SLIF Event Marker Box (RLACS348).
Integration with VBOX HD2 (optional) for video and data overlays.
CAN connectivity (DBC file needed) for broader test setups.

To use the SLIF app for VBOX Touch, you need a VBOX Touch for the primary input and a Video Data Logger to capture the data from outside and inside the vehicle. The app works with a simple button box. If the speed limit on the dashboard does not match the speed limit on the road, press the Black button on the button box to trigger NOK distance. When the speed limit on the dashboard matches the speed limit on the road, press the Black button again to trigger OK distance.

Landing Page

Results

Press the Results button to open the Results pages.

Settings

Press the Settings button to open the app Settings and Diagnostics screens.

New Test

Press the New Test button to start a new test.

Continue Test

Press the Continue Test button to continue the previous test.

Test Display

The test display will provide you with the test data and an easy to read OK/NOK state.

Stop Test

Click on the STOP TEST button when a test is running to stop the test.

Light Conditions

The test must include both driving in daylight and in darkness conditions, where at least 15% of the total distance is done in darkness. By changing the light condition setting in the SLIF app, the app will record the distance and percentage of the total distance that is performed in darkness.

Click on the Light Mode button to toggle between daylight and darkness conditions.


Daylight Conditions	Darkness Conditions

Total Test Distance

This area will display the total distance covered in the test so far.

Road Type Selection

You can select the Road Type you are performing the test on:

Urban
Inter-Urban
Highway

The selected Road Type button will become coloured depending on the triggered state (see State section below), the unselected Road Type buttons will remain grey.

Distances and TP_D

This area will display the Road Distance, Distance NOK and TP_D for the selected Road Type.

State

Depending on the results of the test, the following areas on the Test Display will change to indicate the state:

OK State

NOK State

LEDs

Depending on the set LED behaviour in the settings, the LEDs above the display will do one of the following:

LED Mode - Persist
The LEDs will illuminate green when the state is OK and red when the state is Not OK.

LED Mode - Flash
The LEDs will flash green when the state is OK and flash red when the state is NOK.

LED Brightness - OFF
The LEDs are turned off and will not illuminate.

Frame Around Distances and TP_D

The frame around the distances and TP_D for the road type will be green when the state is OK and red when the state is Not OK.

Road Type Button

The colour of the selected Road Type button will be green when the state is OK and red when the state is Not OK.

Events

When you press the white button on the button box, the Test Display will change the frame and button colour to orange and the LEDs will flash red to indicate and event being marked. Press the button again to stop the event marking and return to OK/NOK state.

Result Page

The results will update live when a test is running.

The colour of the frame around a result will indicate if it is OK or NOK.

Results Page 1	Results Page 2

Results Page 1 will automatically be displayed when you press the STOP TEST button.

This page will provide a summary of the Distance, TP_D, TP_D Variance, Darkness % and Road %.

Use the arrow buttons in the top right corner to navigate to Results Page 2.

Results Page 2 displays an overview of the performed test with the Distance, TP_D, TP_D Variance, Darkness % and Road % for each Road Type.

Settings

When you press the Settings button on the landing page, the Settings and Diagnostics area will be displayed. The Settings page will automatically be displayed.

Brightness

These settings control the brightness of the display and the LEDs. The higher the number the brighter the Display/LED.

Display

1
2
3
4
5

LEDs

Off
1
2
3
4
5

Application

You can change the LED Mode for the application. You can choose between the following:

Persist
The LEDs will illuminate in the state colour when the state changes and will stay illuminated until the state changes again.
Flash
The LEDs will flash in the state colour when the state changes and will turn off until the state changes again.

GNSS

You can adjust the number of GNSS Leap Seconds to apply.

Diagnostics

To access the Diagnostics screen, press Diagnostics in the bottom right corner while in the Settings.

GNSS

This area provides information about the number of satellites being tracked and the constellations they are in.

COLDSTART

Press the coldstart button to perform a GNSS coldstart.

A GNSS coldstart may be required when:

The GNSS engine has locked up.
The VBOX is struggling to acquire satellite lock.

A GNSS coldstart forces the GNSS engine to reset its downloaded almanac of current satellite positions. Constellation almanacs have information about orbit data and research on active GNSS satellites in the constellation.

Hardware/Application Information

This area provides information about:

the serial number
the hardware code
the app version
the system version
the active .vbo file

Hardware Configuration

Connect the equipment as illustrated below:

Note: If you are using a Video VBOX unit instead of VBOX Video HD2, the connections may be different. In most cases, you'll want to connect VBOX Touch to the CAN port on the Video VBOX.

Running a Test

Starting a New Test

Press the New Test button.
Select the Road Type.
The test will begin.
Press a Road Type button any time to change the road type during the test.

Toggle Between OK and NOK

Tap inside the border area on the Test Display or use the Black button on the button box to toggle between OK or NOK.

Events

Press the White button on the button box to mark events. Press it again to stop the event trigger.

Early Test Finish (300 km)

The test should be performed over a distance of 400 km. It may, however, be terminated earlier if the test distance exceeds 300 km and the performance 'TP_D' varied between ± 5.0 % during the final 50 km of the route when calculated on a continuous basis.

Conditions for early finish are monitored from 250 km.

You will get the option to end the test early or continue it.

Stop Test

IMPORTANT

You must stop a test before you remove an SD card or the power from the test system.

You can stop the test at any time by pressing the STOP TEST button.

When a test has been stopped, you can continue it by pressing the Continue Test button on the Landing page.

Post-Test Analysis

Load the files from both the VBOX Touch and the Video Data Logger into VBOX Test Suite for post-test analysis.