WG SXL Standardization 2022-10-14

[emiltin]

Participants

David Otterdahl, Emil Tin, Patrik Backentoft, Torbjørg Haugen, Dimos Kyriakou, Nina Kim Eide Johannessen

Task Description

RSMP can be used for many different types of equipment, and this is indeed already the case in many cities. However, only the SXL for Traffic Light Controllers have been standardized by RSMP Nordic all other uses of RSMP for other types of equipment rely on custom SXLs. This means every project reinvent the same type of messages, and that equipment and systems using these custom SXLs are incompatible.
The task of the working group is to standardize and publish SXLs for other types of equipment.
The tentative list of equipment types include:

• Variable Message Signs
• Traffic Counters
• I/O devices

Work could potentially utilize improvements in Core 4.0 for SXL modules, in case a v4 is implemented, which is the topic of the v4 working group. The two working groups must therefore coordinate.

Timeline

Initial draft:
Invite suppliers to working group: 2023
Tentative release: autumn 2023
Note that the activity plan had October 2022 as a tentative release schedule, but this is no longer possible.

Variable Message Signs

Prior Art

VMSes in Copenhagen, bitmap in colors, custom SXL.

Features

• On/off, or a number of modes
• Text
• Bitmaps – jpeg, bmp, etc.
• Different width/height
• Monochrome or color
• Geo referencing
• Predefined screens
• Interaction, integration with other systems, e.g. a local traffic counter.
• HTML?

Traffic Counters

Prior Art

The existing SXL for traffic signals contains messages for traffic data, including number, classification, and occupancy. Some classes are specified, e.g. truck, car, motorcycle, etc., but it is not described what, for example, is defined as a truck.
CPH: SXL for traffic data, originally copied from traffic signal SXL.
Trafikverket: uses sxl for traffic signals for traffic data, but a separate one for active bumps
Work in the Nordic group regarding the classification of vehicles. Norsight
Norway: storage of data on individual vehicles in a central system.
Analyzes of historical trends often require maintaining the same classification.
Difference between coils and pneumatic hoses, e.g. whether you get the number of axles. Finland uses a lot of radar.
Should talk to the users of traffic data – often non-technical people.
How should data be shared, with whom and in what format? Are there, for example, EU standards that we must integrate with?
Classification is a topic in itself, and is different in each country.

Features

• Volume
• Classificaiton – evt. efter forskellige standarder (svenske, norske, EU, nordsikt, etc)
• Physical measures, e.g. nubmer of axels, length, height, etc.
• Turn movements
• Speed
• Occupancy
• Ways to aggregate, e.g. sum, min, max, median, etc.
• Headway, gap
• Queue length
• Travel times, OD-matrix

##I/O devices
###Prior Art

Features

Next steps

Consider whether there are colleagues who should be invited along
Are there more features we should consider?
Is there current equipment in use that we need to look at? Which SXLs do they use, and can they provide documentation for these SXLs?