I discourage processionals as I think they are unnecessary and hazardous on many levels.
I do always produce and provide maps to everyone and encourage that they drive on their own safely to the next destination.
And a point of safety: a processional should have at least 1 motorcycle escort for every 5 cars. At no time should any mourners think that blowing red lights without a professional team of motorcycle escorts providing coverage and supervision is acceptable or safe in any way.