Fixed speed cameras: prevention and shortcomings

There are two sorts of cameras. The first variety takes photos of vehicles passing through red lights. These are easy to spot, for they «preside» over the crossroads in question. The others are there to control speed limits of 50 km/hour applicable throughout the Brussels areas, except residential areas where the authorised speed cannot exceed 30 km/hour.
The first speed cameras were placed along the main roads into the city, and on avenues with dual carriageways. Their presence should be more of a «preventive», rather than repressive nature, for drivers who often take these roads know where they are: the traffic will therefore «naturally» slow down. Outside peak times - and mainly at night... -, this is when one easily gets «trapped». Moreover, the 50 km/hour limit still applies to the tunnels on the inner ring road, which is totally absurd. The limit has increased to 70 km/hour in the tunnels along Avenue de Tervuren and along part of the Avenue, as proof that sometimes common sense will prevail. Luckily for the moment there aren't (yet...) any fixed speed cameras in the tunnels, because installing them is tricky. The tunnels on the inner ring road do not have places where unmarked cars belonging to the Federal police can park either. There are, however, several such places in the Léopold II tunnel in the direction towards the Basilica and the city centre. Always beware of cars parked in the emergency parking spaces here!