Blue reflectors on the road typically indicate the location of a fire hydrant or a nearby water source for firefighters to use in case of emergencies. They help emergency responders quickly locate these resources, especially during nighttime or low visibility conditions.
They can probably mean different things in different states. In my area they mark the location of roadside fire hydrants.
You are going the wrong way on a road.
Some names for specific types of raised pavement markers include Botts' dots, delineators, cat's eyes, road studs, or road turtles. Sometimes they are simply referred to as reflectors.
The average road reflectors in America are orange. Orange is the standard color b/c it is bright and can be highly reflective. Also, the color orange usually stands out on roads.
Catseye's are reflectors that sit in the middle of the road and light up at night.
Known as cats eyes Invented by Yorkshire man Percy Shaw
To see the road at night.
on the wrong side of the road
I'm not sure of Texas law, but I'm sure that it's similar to Illinois. In Illinois, it specifically states that they must be lighted, so reflectors won't work.
You are going the wrong way. White means correct direction, red means opposite direction (wrong way), blue means a fire hydrant near.
If the bicycle is road legal(has brakes, lights, reflectors) - sure.