I'm researching issues related to road tolling in Europe and worldwide. The specific area is tolling systems based on actual vehicle weight and distance travelled but I am also interested in pointers to systems in place or at an advanced planning stage which implement variations on this theme. Straightforward 'turnpike' systems with variable tolls based on (apparent) vehicle SIZE or category are NOT immediately relevant to my enquiries. Please let me know if you have been involved in the implementation of such systems. I am particularly interested in NEGATIVE aspects (political, social, economic and technical) of such schemes, when they were first mooted, first implemented and after they had bedded-in for a while. For example, (unanticipated) side effects such as individual route-changing behaviour to avoid tolled parts of a route. Also, if you know of relevant schemes that reached detailed planing stage but were then abandoned or postponed, I would be interested in these, and the reason(s) for failure. Many thanks for your help. -- John Brooks %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%