What are the conditions on which you are allowed to carry out loading on the edge of the roadway?

You answered correctly. Loading on the edge of the roadway is only allowed if you do not impair traffic safety and you do not ignore any "no stopping" signs. This means you must always ensure other road users are not put in danger or unreasonably hindered when loading or unloading, and you must obey posted signs prohibiting stopping or parking. Slight endangerment of traffic is never allowed during loading; traffic safety always takes priority. Always assess the situation to make sure your actions are safe and legally permitted.