That captcha on the CIRA page is getting kinda irritating as well.
I sat there for a while last night trying to discern the contents of purposely-hazy images and to determine exactly which squares contained the traffic light and crosswalks portions of the image... and failing badly.
One of the motorbike ones kept failing until I realized that a tiny portion of the hazy image had what looked like 1/8 of a motorcycle wheel on the bottom-right. So I clicked it and mercifully received 1 of my 10 codes.