Just wanted to post an update. I now use either 2 or 3 cones on all lawns I do. If it's a busy road I put 2 behind the trailer, one in front of the vehicle. I use the 18" cones that are like $10 at Home Depot, but I also got 18" cones with a reflective strip to use when I do snow removal at night. After getting a flat tire on the highway the other month, I now keep multiple cones in each vehicle, just in case. They have come in handy!