we used to charge travel time also, however in todays climate i have stopped doing that, no one has ever asked me my hourly rate, and to be frank i dont have one as its a non starter in my book. i simply price the job on how long i will be on the site, the travel expense ( and travel time ) is down to me and my end of year books/expense. loads of people who are working for employers dont get that benefit, thet may need to commute for two hours each way daily, but only get paid from when they start work, so why should i be different ( as i said i used to do that but now i dont)