Which statement about enforcing and limiting cargo loads is correct?

1. ①The provincial police commissioner can limit the number of passengers but cannot limit load weight or load size
2. ②Road management authorities have no duty to provide load measurement data even when the provincial police commissioner requests it
3. ③Whether the load weight standard was violated can be checked only through documents submitted by the driver
4. ④To check for violations of the load weight and load size standards, the provincial police commissioner may request load measurement data from the road management authority (including the Korea Expressway Corporation)