*_EVERY_* jammer on the market today, including the LI, will suffer from some performance degradation when exposed to direct/bright sunlight glare.
A simple, albeit somewhat inaccurate picture can be painted as such:
Imagine a darkened room, and what a flashlight, 10 meters away, shining at you, would look to your eyes. Nice and bright, right?
Now, bring the ambient illumination in the room to daylight levels. Do the same with the flashlight. The flashlight beam is much dimmer, and nearly non-visible, no?
The same thing is being "seen" by the jammer's receiver - when the SIA is tripped, it alerts to a situation where excessive sunlight is partially "blinding" the jammer, causing it to perhaps not see the incoming LIDAR as well as otherwise (or, on the other hand, that its output jamming beam is being perceived as less effective, by the receiving police LIDAR
Whatever the true reason, the end result is the same --> yes, the jammer will still block LIDAR, but it won't be quite as effective. Unpredictable/earlier PTs can arise under such situations.
Look at the Osijek test that the SpeedLab members participated in.
Against the Laser Atlanta, to which the LI is a "true-JTG capable" countermeasure, with the bright, direct sunlight, look at the PT numbers.
, today, is immune to sunlight interference.
If you can physically recognize the situations which may elicit the SIA warning on the LI, and you cannot abide by its repeated voice alerts, you *can* switch it off completely, or increase the recycle time (so that it will not alert as-frequently) via the LI interface software controller.
However, please be aware that situations such as snow (or sand)-reflected glare, etc., can also "blind" the jammer, and will elicit the SIA. As-such, you should fully educate yourself as to what kind of situations, in your geographic area, will elicit the SIA, before you elect to turn it completely off.