MemberApril 7, 2008 at 7:27 pm
What you need is an interference pattern laser projection device. This will allow you to project your image or message of choice into the air beside the motorway. Highly portable, unaffected by weather conditions and capable of producing a sign of any size depending on the power of the lasers used.
No planning permission required cos none of the planners have any idea what it is 😛