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Wikipedia

R/T

R/T is the performance marker used on Dodge automobiles since the 1960s (much like Chevrolet Super Sport). R/T stands for Road/Track (no "and"). R/T models come with R/T badging, upgraded suspension, tires, brakes, and more powerful engines. Some models come with monotone paint and stripes, as well as aggressive body parts. The ChryslerSRT Division ( Chrysler Corp. SRT Vehicles) has been the high performance auto group for Dodge vehicles from 2004 until present, therefore the R/T designation doesn't carry the status it once did. The R/T vehicles, however, still carry upgraded badging and performance indicative of their heritage.

Wiktionary

r/t

alt. radiotelephone; radiotelegraph. init. radiotelephone; radiotelegraph.