Of course different from a HGV it was not that often that I parked up in lay bys for safety reasons, whilst you are asleep there is every chance some b@stard will steel your wheels ( No I'm not joking) might rob you, it has been known that Drivers have been awaken thinking they are talking to the police to find that the persons are there to rob you, myself, I used to park in Ind estates with, at times CC-TVs present around the area, I am not trying to frighten you but you have to think about safety on this one, also don't forget this important issue, if you have had a drink or 3 the police can do you for been in charge although you may have your underpants on, if you think this is not the case ask the police, one of our drivers was put in cells overnight but was not breath tested but I am going back 20+years.