In examining home addresses of burglars and the addresses of their targets, Jerry Ratcliffe found that burglars did not, as expected, work in their own neighbourhood. Most burglars (77 per cent) travelled away from their home suburb to do their work, travelling an average of five kilometres to their target. There was no evidence that physical boundaries separating suburbs, such as carriageways and parkland, acted as barriers inhibiting burglars' movement. This has important implications for both urban design and crime prevention.