From back cover:
Startown... the rough and tumble district on any world where travellers can find anything from entertainment to the worst sorts of crime and corruption. Condemned by the majority of honest citizens, exploited by the criminal subculture, and visited by starship crews and other travellers looking for entertainment, information, jobs, or almost anything else, this is "a wretched hive of scum and villainy"...this is Startown.
Startown liberty is a collection of detailed encounter tables designed to generate random encounter situations for Traveller. From the streets to the nightspots to the back alleys of Startown, tables and encounter descriptions give depth and detail even to innocent encounters that may have no bearing on the adventure or campaign at hand...but serve to provide flavor, atmosphere, and a source of distraction or even new adventures that will serve the Traveller referee in good stead.