About product and suppliers:
            232 20 mph sign products are offered for sale by suppliers on Alibaba.com, of which traffic signs accounts for 11%. 

A wide variety of 20 mph sign options are available to you, 

There are 32 suppliers who sells 20 mph sign on Alibaba.com, mainly located in Asia. The top countries of supplier is China, from which the percentage of 20 mph sign supply is 100% respectively.