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Message: [QUOTE="KWJams, post: 162123, member: 19939"] [b]Exaggerate--me?[/b] :confused: California Highway Patrolmen have these disks they carry that look like film negatives. they are opacity meters. When a big truck or bus goes by belching smoke they hold them up and compare the color of the disk with the smoke. If it is to dark, they can issue a pollution ticket. Sad thing is when they passed that law the costs were passed on to the consumers for new high tech diesel motors etc... But,,,,it doesn't matter because folks don't care. :) [/QUOTE]