diff --git a/tmp/lanelet2_extension/docs/crosswalk_traffic_light.svg b/tmp/lanelet2_extension/docs/crosswalk_traffic_light.svg
new file mode 100644
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@@ -0,0 +1,121 @@
+
+
+
diff --git a/tmp/lanelet2_extension/docs/lanelet2_format_extension.md b/tmp/lanelet2_extension/docs/lanelet2_format_extension.md
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--- a/tmp/lanelet2_extension/docs/lanelet2_format_extension.md
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@@ -231,6 +231,47 @@ _An example:_
```
+### Traffic Lights for Crosswalks
+
+It can define not only traffic lights for vehicles but also for crosswalk users by using regulatory element. In this case, the crosswalk lanelet needs to refer the traffic light regulatory element.
+
+![crosswalk_traffic_light](crosswalk_traffic_light.svg)
+
+_An example:_
+
+```xml
+
+
+
+
+
+
+
+
+...
+
+
+
+
+
+
+
+
+...
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
### Safety Slow Down for Crosswalks
If you wish ego vehicle to slow down to a certain speed from a certain distance while passing over a