Blue reflectors are used to mark __ fire hydrants construction zones center left turn lanes white lines

## Step 1<br />This problem is related to the field of traffic engineering, specifically the use of road markings and signs. The question is asking about the purpose of blue reflectors on the road.<br /><br />## Step 2<br />Blue reflectors are typically used to mark fire hydrants. This is because blue is a color that is easily distinguishable and can be seen from a distance, making it ideal for marking important safety features like fire hydrants.<br /><br />## Step 3<br />The other options, such as construction zones, center left turn lanes, and white lines, are not typically marked with blue reflectors. These areas are usually marked with other types of road markings or signs.