What is the safe speed to use highspeed turnoff?
Please be careful applying a blanket figure during high speed turnoff. There are many variables which you should consider. These are:

•   Exact angle of the taxiway(you're turning onto):  If it's a very shallow angle off the runway and therefore does not require much turning, high-speed turnoffs are easier and manageable, and vice versa.

•   Rate of deceleration

•   Side load limitations on the CRJ

•   Tolerance of the nose gear

•   Traffic situation on taxiway

Generally speaking you need both sets of eyes outside, especially if you are joining or crossing another Taxi Way.