It appears that the east side of SW 127th Avenue between Miller Dr (56th St) & Bird Rd (42nd Street) was partially striped for bike lanes earlier today. There are no bike lane signs up yet, but I can't imagine it being anything other than bike lanes, unless it's an equestrian path, keep in mind this part of Miami-Dade is known as "Horse Country". There's an abundance of migrant workers who ride their bicycles in this area as it is their only means of transportation. It's unfortunate that due to lack of education these bike lanes will go mostly unused, the 40mph speed limit will also discourage most people from using the lanes and remaining on the sidewalks.

Update 4/29
These are indeed bike lanes and they extend from Bird Rd to Kendall Dr on 127th Ave