The ornamental design for a toyracetrackstraightawaysegment, as shown and described.
FIG. 1 is a top, front perspective view of the toy race track straightaway segment, showing my new design;
FIG. 2 is a front view of the toy race track straightaway segment;
FIG. 3 is a rear view of the toy race track straightaway segment;
FIG. 4 is a top view of the toy race track straightaway segment;
FIG. 5 is a bottom view of the toy race track straightaway segment;
FIG. 6 is a right side view of the toy race track straightaway segment; and,
FIG. 7 is a left side view of the toy race track straightaway segment.
The broken lines in the drawings illustrate environment and portions of the toy race track straightaway segment that form no part of the claimed design.