Is it possible to manipulate traffic in cities with some computer tools and knowledge? A recent hack of a taxi app in Moscow has already tilted the answer in the affirmative. In Germany, researchers warn of the obsolescence of certain protocols used in traffic lights.
A fairly simple hacking technique
These experts have thus demonstrated that it is possible to change certain traffic lights from red to green quickly, or conversely more slowly, with a simple quick manipulation on a computer. The hacking process would therefore only require a laptop, a radio and a simple antenna.
To prove their point, two computer scientists made an appointment with several journalists at a very busy crossroads in the north of Hanover. Installed in a car, they were able to tame the timing passing traffic lights green as they please during the demonstration. The system is sufficiently secure not to allow, for example, all the lights to turn green at the same time. It could, however, be manipulable enough to create monster traffic jams or increase the likelihood of accidents.
The objective of the researchers is to demonstrate the potential danger of this type of installation which has become obsolete. The experts say they have no other intention than to point fingers, but wished to remain anonymous so as not to expose themselves to criminal sanctions. They rely on the press to relay their discovery.
An obsolete system in the digital age
In reality, this flaw is based on a system supposed, conversely, to make traffic more fluid. The computer scientists behind this announcement use the same analog radio signal as that used on buses and trams, which makes it possible to hasten the passage of a green light when these vehicles approach. This technology dating from the 80s, the signal is obviously not encrypted.
Media also asked 13 major cities in northern Germany whether they use similar technology to control traffic lights and give way to buses and trains. As a result, almost all of them use old analogue radio technology and admit that it can pose a risk. In all, almost 80 German cities still use analogue signals.
Fortunately, by 2028 German cities must legally switch their traffic lights to a digital radio signal. An encrypted signal and therefore more secure, this time.