Motorcyclists can make themselves more visible at night by

a. driving at slower speeds
b. driving in the center of the lane
c. putting reflective tape on their helmet and clothing
d. using high beams most of the time

Motorcyclists can make themselves more visible at night by putting reflective tape on their helmet and clothing.

This will make drivers more cautious because the tape will kind of have a glare to it making the cyclists easier to see.
Hope this helps!

Ithink its answer a)

Some connecting rods have to lubricate the cylinder wall or piston pin. the answer is letter d. graphite coating can be a major  additive to many  coating  systems and things such as connecting rods.  it functions as a refractory, lubricant, thermal conductor, and electrical conductor for a machine or thing to enhance its work.