Measurements of loading arm behavior on compact tension type, transversely wedge-loaded crack arrest specimens have been made. A crack-opening measurement point close to the crack initiation site was selected in addition to face or load-line position. Conclusions concerning acceleration, vibration, and damping behavior of the specimen arms were reached and differences in the behavior of two alternative specimen types are indicated. The influence of fracture morphology on specimen behavior is reported in detail. Suggestions for further work to clarify crack run-arrest behavior of tentative test specimens are presented.