Some re ections on the conversion of theTIC lexicon into

The Traac Information Collator (TIC) 1 (Allport, 1988, 1989) is a prototype system which takes verbatim police reports of traac incidents, interprets them, builds a picture of what is happening on the roads and broadcasts appropriate messages automatically to motorists where necessary. Cahill and Evans (1990) described the process of converting the main TIC lexicon (a lexicon of around 1000 words speciic to the domain of traac reports) into DATR (Evans and Gazdar, 1989a, 1989b, 1990). This paper reviews the strategy adopted in the conversion discussed in that paper, and discusses the results of converting the whole lexicon, together with statistics comparing eeciency and performance between the original lexicon and the DATR version.