With immediate effect a new icon appears in front of any tunnel when a speed camera is located inside the tunnel or not more than 200m after the end of the tunnel. So you will get an alert early enough in your sat nav device although the GPS fix is missing in the tunnel. This new service of SCDB is available for all European countries and it is included in most plug-ins from SCDB. The following picture shows a 100 kph speed camera (ID 15322) at the "Lieferinger Tunnel" in Salzburg.
Example: Salzburg, A1 Lieferinger Tunnel The new icon point out to the following speed camera at the end of the tunnel.