Hydreon also makes an automatic wiper control system for vehicles.
http://www.raintracker.com/I just received one as a Christmas gift, I'll let everyone know how well it works once I install it.
Installation on my car (2000 Toyota Solara) should be rather simple (Hot Side Switching), cut & splice into the low speed wire and tap into the high speed wire.
http://www.raintracker.com/compatibility/asian/hss_rt-50a.pdfMy mother's Buick has automatic wipers and I loved using them on a Cincinnati to Chicago trip several years ago. Never had to touch the controls in constantly changing rain and encounters with spray from semi-trucks! I originally thought I would need to scavenge parts from a junk yard Lexus to add this to my Toyota...until I discovered Hydreon made these.