I will be visiting DLR in early June with my DD6 and DD8 by myself. I think I figured out all the logistics of riding rides with only one adult for everything except Autopia. My DD8 is 52 inches. According to the DL website, you must be 54 inches to ride alone. Is this a hard and fast rule? Has anyone else encountered this problem? She really wants to ride this and I hate to tell her no if I don't have to.