Clearance required to use high speed exit?

[RJ.146]

Hi All,
I'm curious about the use of High Speed Exits, and if a clearance to use a high speed is required? I've had a look at Part SERA, CAP413 and others and can't find much on the subject.

For Instance, if I were to land and not receive instructions to the contrary would it be acceptable to assume I may vacate onto a rapid exit taxi way and hold prior to the adjacent taxiway? Would lead off lights affect the situation?


Thanks!

RJ