Go to show assets and grab a sequence someone has shared. Then just use a dummy music file or create an "empty" music file in audicity or modify the xml in Notepad++ to make it an animation sequence before opening in xLights. There are tons of shared sequences out there. Music is not a requirement to run someone else's sequence. Find one with lots of activity and your viewers will probably never know the difference.
As for the 40-60mph, use police light colors and strobe effect to catch people's attention :-)