More of a style nit, but all of your if (!$INPUT{'radar'}) {$INPUT{'radar'} = "false"}; statements could be replaced with:

use constant TECHNOLOGY_TYPES =>
    qw( radar laser vascar airplane photo roadblock unknown );

for my $tech ( TECHNOLOGY_TYPES() ) {
  $INPUT{ $tech } ||= "false";
}
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Of course that sidesteps the problem that you've used CGI and yet for some reason are doing your own query parsing (which is in itself a red flag) . . .