These really look like 18-inch signs.
http://maps.google.com/maps?hl=en&ll=29.50683,-81.309342&spn=0.000019,0.012531&t=m&z=17&layer=c&cbll=29.506719,-81.309368&panoid=o5yjU_Zcc_y2Vk8BYLL9qw&cbp=12,32.62,,1,0 (http://maps.google.com/maps?hl=en&ll=29.50683,-81.309342&spn=0.000019,0.012531&t=m&z=17&layer=c&cbll=29.506719,-81.309368&panoid=o5yjU_Zcc_y2Vk8BYLL9qw&cbp=12,32.62,,1,0)
http://maps.google.com/maps?hl=en&ll=29.506792,-81.308548&spn=0.000037,0.025063&t=m&z=16&layer=c&cbll=29.506828,-81.308664&panoid=--Fg0J6AOLvyjmXrwcf-yw&cbp=12,329.11,,0,0 (http://maps.google.com/maps?hl=en&ll=29.506792,-81.308548&spn=0.000037,0.025063&t=m&z=16&layer=c&cbll=29.506828,-81.308664&panoid=--Fg0J6AOLvyjmXrwcf-yw&cbp=12,329.11,,0,0)
http://maps.google.com/maps?q=flagler+county,fl&hl=en&ll=29.321308,-81.417883&spn=0.100129,0.2005&sll=29.677613,-81.454697&sspn=0.199554,0.401001&hnear=Flagler,+Florida&t=m&z=13&layer=c&cbll=29.321308,-81.417883&panoid=c_H9uR5_d9HIhwqI1moYlA&cbp=12,118.99,,0,0 (http://maps.google.com/maps?q=flagler+county,fl&hl=en&ll=29.321308,-81.417883&spn=0.100129,0.2005&sll=29.677613,-81.454697&sspn=0.199554,0.401001&hnear=Flagler,+Florida&t=m&z=13&layer=c&cbll=29.321308,-81.417883&panoid=c_H9uR5_d9HIhwqI1moYlA&cbp=12,118.99,,0,0)
and, and old secondary sign:
http://maps.google.com/maps?q=flagler+county,fl&hl=en&ll=29.343389,-81.309857&spn=0.025027,0.050125&sll=29.677613,-81.454697&sspn=0.199554,0.401001&hnear=Flagler,+Florida&t=m&z=15&layer=c&cbll=29.343394,-81.309996&panoid=n1YiwCWRxhEaRwpAgVdOcA&cbp=12,109.91,,0,12.53 (http://maps.google.com/maps?q=flagler+county,fl&hl=en&ll=29.343389,-81.309857&spn=0.025027,0.050125&sll=29.677613,-81.454697&sspn=0.199554,0.401001&hnear=Flagler,+Florida&t=m&z=15&layer=c&cbll=29.343394,-81.309996&panoid=n1YiwCWRxhEaRwpAgVdOcA&cbp=12,109.91,,0,12.53)