Reflectors

Although MEX has delineator strips in the form of rectangular reflectors at all guardrails throughout, MEX has implemented additional high-quality reflectors at a uniform specified height at every upright guardrail post. These are of greater surface area, being about 8 cm x 10 cm, and serve to augment night-time vision considerably.
Together, these 2 sets of reflectors serve to aid the motorist in dark and inclement conditions. Even without highway lighting, these reflectors would be able to guide motorists safely