as a person that shoots a lot in the dark and with flashing lights this is what i do.
the flashing lights well there is not a lot that can be dun they throw off the AF ALL the time so MF is a good way around that.
when i photo a wreck i often focice on the police cars becuse there wite and the police ect.. unforms are dark. lots of the time i hope that the deth of feild is deep enff to get what i wont. i also focice on the fierfighters cotes becuse they are refletive and make a good spot to work with.
like every one else sed fast lenes are a must, the kit is a good lens but not that fast
this is an extreme example
http://thephotograph.blogspot.com/2007/04/man-shot-in-staunton-april-22.html
the police keeped the press way far off so i had to shoot with what i had. it was all dark and i had to shoot with my Sigma 70-300 witch is SLOW, but at the time it was all i had they where shot at 1 1/2 second i braced my self agenst a telephone pole and prayed. but i used the police cares to focice on. they are not the prist photos but i was the only one to get any that night. the police where a little over 200 yards a way.