The main problems seem to be in urban areas where a high vehicle density is found. Congestion charges don't seem to reduce this, just generate cash. I can visualise development of electric public transport, city centre delivery of goods by approved vehicles only to reduce diesel vans/lorries. These have increased with the increase in internet shopping and proliferation of courier companies. Maybe hubs would be set up for local non polluting vehicles to finish off delivery from ( deliver bulk to outskirts and EV city centre delivery type scenario?). The continued taxation route doesn't seem to help so far, but is a cash cow. Either develop diesel exhaust cleaning systems or make radical changes to the transport structure.
