It really depends on where you live in the US. When I moved from Los Angeles to the Atlanta suburbs my daughter rode her bike to elementary school like she always had. The school principal called and told me it wasn't allowed. I offered to ride with her since I work from home and it wouldn't be a problem but she wouldn't budge. I offered to fund raise for bike racks, setup bike trains, and give safety courses. I tried for years and years, through three kids, and never got permission. My kids are all grown now except my oldest who does indeed ride an e-bike to high school.