Cultural differences between towns and cities can potentially put women in danger, according to the Suzy Lamplugh Trust.
A study carried out by the Trust has shown that people travelling into the capital from the regions are perhaps the most vulnerable as they may not be familiar with the London taxi system.
Man, 17, tells of sex attack ordeal after night out.
A bogus taxi driver attempted to rape a 17 year old youth as he tried to make his way home from a Midland nightspot.
New figures released by Scotland Yard have revealed that illegal minicab drivers commit an average of two sex assaults every week.
In 2003 alone 120 sex assaults were committed by unlicensed cab drivers which included 36 rapes. The Metropolitan Police believe this figure could be much higher as a significant number of attacks are believed to go unreported.