|Devices that measure and document traffic violations and their coverage zone|
|Tools for this tag|
This relation documents different kinds of permanently installed devices that measure and document traffic violations, such as:
- speed traps
- red light cameras
- distance between vehicles measuring
- weight check (heavy goods vehicles)
- ordinary traffic checks (papers, use of alcohol, etc.)
- compliance with road toll regulations (currently specifically the Toll Collect system in Germany)
- Average Speed Check (SPECS)
These devices belong to the same class of objects and shall therefore use the same tagging schema with different values. Sometimes a combination of values is required if the device serves more than one function (e.g., both a speed trap and red light camera in one device).
Where to map?
Note that some countries forbid mapping traffic enforcement installations. If rendering or displaying in a routing software or alerting in a routing software is forbidden anywhere, you can add the information to the map - renderer and routing software will make sure to follow the law. Therefore, routing software shall offer traffic enforcement features as plug-ins, so the user can choose if he wants to install the feature.
Traffic enforcement devices are not a place you'd want to go and are therefore not an amenity.
Create a single relation for each traffic enforcement device, if there are several, as each can measure different things to vehicles from different directions.
|type||enforcement||enforcement||The type of relation.|
|enforcement||maxspeed / traffic_signals / check / access / maxweight / maxheight / mindistance||maxspeed||The type of enforcement.|
|enforcement||toll||toll||HGV toll enforcement camera bridges and pillars in Germany (seeon Wikipedia), checking system compliance.|
|enforcement||average_speed||average_speed||Average speed measuring speed camera system / Section Control (seeon Wikipedia)|
|maxspeed||number; specify unit if not in km/h||60||The maximum speed (optional, only specify if enforcement=maxspeed)|
|maxweight||number; specify unit if not in tonnes||16||The maximum weight (optional, only specify if enforcement=maxweight)|
|maxheight||number; specify unit if not in metres||4||The maximum height (optional, only specify if enforcement=maxheight)|
|mindistance||number; specify unit if not in metres||80||The minimum vehicle distance (optional, only specify if enforcement=mindistance)|
|maxwidth||number; specify unit if not in metres||4||The maximum vehicle width (optional, only specify if enforcement=maxwidth)|
The "mindistance" enforcement is for following distance. The "check" enforcement is for a checkpoint.
Example 1: Simple Redlight camera
A redlight camera at a crossing.
N | | W----------*---#-----------------E | | S
Example 2: Redlight camera for turning left only
A redlight camera at a crossing, only taking photos of cars coming from the west turning left to the north.
N | o | W----------*---#-----------------E | | S
Note: Use the "to" role if the device is placed in a way it affects vehicles going to different directions differently. As shown in example 1 the "to" role is optional, as long as the device node is member of the road way.
Example 3: Speed Camera
Example 3a: Simple speed camera on the street
A speed camera on or in the middle of the street, taking pictures of vehicles coming from the west going to the east.
Example 3b: Simple speed camera next to the street
A speed camera next to the street, taking pictures of vehicles coming from the west going to the east.
Note: This example illustrates the case where pictures are taken from the front of the car.
Simple video tutorial on doing this in JOSM: http://www.youtube.com/watch?v=2tnohs_8gFY
Simple video tutorial on doing this in Potlatch: http://www.youtube.com/watch?v=oJlqlchv4vU
Example 3c: Speed camera making pictures from the back
A speed camera on a very high post on the other side of individually mapped lanes, taking pictures of vehicles coming from the west going to the east, taking the pictures from the back to see licence plates of motorbikes.
# ================================== W----------*----o------------------E
- "==" Way: These are the lanes of the opposite direction of this motorway.
- "#" Node: device,
- "*" Node: from
- "o" Node: to (mandatory, because the device is not on the road)
Example 4: Speed camera for both directions
A speed camera next to the street, that can be turned in both directions.
Note: This is not done in one relation, because then it would not be normalized.
Example 5: Distance between vehicles
A camera films your vehicle, measuring if you have enough distance to the vehicle ahead, only for vehicles from the west going to the east.
- "#" Way: device, (Because the camera covers a larger distance of the street, use "way" not "node")
- "*" Node: from
- "o" Node: to
Example 6: Maximum weight
The police separates some heavy goods vehicles from the motorway to the parking lot to check for maxweight violations.
W--------*----------------o----------E \ / \-####-/
- "#" Way: device, (This is the large hgv scale, so it's not a node but a way or an area.)
- "*" Node: from
- "o" Node: to
Example 7: Height check before tunnel
(This example is found at Elbtunnel, Hamburg, Germany) A light barrier checking if a vehicle coming from the west violates the maxheight for a tunnel. If a vehicle is too high to pass, an automatic red light and road block will be activated.
W--------*----#--§--=====o----------E \ \
- "#" Node: device, maxheight=3.80 (Maxheight needed for the rendering)
- "*" Node: from (Here a sign says: Turn right if your vehicle is higher than 3.8m)
- "===" Way: tunnel=yes, maxheight=3.80 or maxheight:legal=3.80
- "o" Node: to
- "§" Node: force (Here an automatic traffic light stops you, if your vehicle is too high)
Note: Why is this so much more complicated than the other examples? Height checking devices are not for fun, and not for collecting fees, they are installed to avoid trucks crashing against tunnel walls. Therefore there are often automatic road blocking installations. If such installations are not present, the "force" role is optional, of course!
Missing maxspeed value for enforcement relations
- highway=speed_camera – another tagging scheme for speed limit enforcement cameras
- man_made=surveillance - A surveillance camera or other type of surveillance equipment
- highway=speed_display - a dynamic electronic sign that displays the speed of the passer-by motorist
- amenity=weighbridge - a large weight scale to weigh vehicles and goods
- barrier=height_restrictor - a height restrictor which prevents access of vehicles higher than a set limit
- Original proposal