Most places, it's not weight that triggers the lights, it's a magnetic thing. If you have a lot of steel in your vehicle it will interrupt the flow of the electrical flux around the wiring. The way to tell if it's magnetic or weight triggered, The magnetic ones usually have in imprint in the street that can be round or square and some other shape, that doesn't look like a metal plate. If there is a metal plate there, it's probably weight activated.
Ride just off to the side of the magnetic wire running parallel to you, or if it's a circle ride about 76" inside the circle. These are usually the best spots to trigger the actions.
There is no guarantee with these locations, but it's where I have the best luck. Does not mean it will work everytime. But I fairly good luck with them.
Most people think they are weight activated, but they are wrong in most cases. It have the media print it like that doesn't surprise me. they get most everything wrong!
Bare