Fledgling Blackbird

As I went to collect the milk this morning from outside our back door I noticed a fledgling Blackbird sat on my car. I'm not sure how long it's been there for but it's not active at all and as yet there's no sign of its parents feeding it. I'm not sure what to do but I do need to drive to work at some point today. I know they should be left alone but if it's been out all night it's probably cold and hungry Disappointed