Yes, as it is effective immediately after installation, a radar speed sign is still impacting on the long term.
As mentioned above in the question “What is the effectiveness of a radar speed sign”, visual stimulation generated by the radar has a direct psychological impact on the motorist. What makes the difference between one and the other, is the reason behind slow down: deterrent effect or the “fear of the police.” According to a study led between 2012 and 2014, “speed get back to their original level upon removal of the radar speed sign”.
This long-term effectiveness is evidenced by the returns of our clients including those investing again several years after their first installed radar speed sign (over a third of our clients re-order after the acquisition of a Evolis radar speed sign).
To evaluate the effectiveness of a radar speed sign in the long term, we must separate two types of drivers:
Regular users (residents …) are reminded everyday that they are speeding. It has a conscious effect (impact of visual stimulation) and inconscious effect (to be aware of having a dangerous behavior)
Moreover, once they are used to drive gently at a place on a daily commute, it’s easy to maintain this habit with the radar speed sign.
The one-time users of the axis (transit traffic) will be systematically surprised while seeing the radar speed sign and will slow down, even if it is installed long ago.