var $active_light = $('#traffic_light input.on');
$active_light.bind('click', function(){...})
	.css('border', '3px dashed yellow')
	.css('background-color', 'orange')
	.fadeIn('slow');

http://www.artzstudio.com/2009/04/jquery-performance-rules/

Use chaining in jQuery to reduce the code size and gain better performance.

jQuery Chaining

javascript, jquery

JavaScript