if you wont see so many cameras on map open with winrar data/ui_nextgen/common/open default.vis,find
[speedcams]
speedcam_default_visibility=2000
delete and replace with
[speedcams]
speedcam_default_visibility=140
speedcam_category_visibility = 0,100
speedcam_category_visibility = 1,80
speedcam_category_visibility = 2,100
speedcam_category_visibility = 3,100
speedcam_category_visibility = 4,100
speedcam_category_visibility = 5,100
speedcam_category_visibility = 6,100
speedcam_category_visibility = 7,100
speedcam_category_visibility = 8,100
speedcam_category_visibility = 9,100
speedcam_category_visibility = 10,100
speedcam_category_visibility = 11,100
speedcam_category_visibility = 12,100
speedcam_category_visibility = 13,100
speedcam_category_visibility = 14,100
speedcam_category_visibility = 15,100
speedcam_category_visibility = 16,100
speedcam_category_visibility = 17,100
speedcam_category_visibility = 18,100
speedcam_category_visibility = 19,100
speedcam_category_visibility = 20,100
speedcam_category_visibility = 21,100
speedcam_category_visibility = 22,100

i take it from garigor ux