Per the AAMVA CDL Manual's "Manage Space" guidance, why must a driver of doubles/triples allow more following distance and ensure large enough gaps before entering or crossing traffic?

49 CFR 383.115(e); AAMVA CDL Manual Section 7.1.5 "Manage Space," p. 7-1

This connects directly back to the CFR's listed knowledge requirements for the endorsement — slower speeds, longer stopping/turning needs, and the extra length of a doubles/triples rig all point to the same operating-practice lesson: this combination simply needs more room to safely interact with traffic than a shorter vehicle does.