QUEZON CITY, (PIA) --Department of Public Works and Highways (DPWH) Secretary Manuel M. Bonoan has issued Department Order No. 19, series of 2023 setting guidelines on the standard designs for solar-powered roadway lighting along national roads.

The guidelines was issued following the approval on the use of solar-powered street lights on public works projects.

“In future DPWH projects with street light components, we hope to utilize solar-powered roadway lightings considering its stability, long service life, ease of installation, safety, and of course, energy efficiency, making it ideal for use alongside both new and existing roads,” Bonoan said

DO 19 will serve as the reference of DPWH Regional Offices, District Engineering Offices, Unified Project Management Office Clusters, and DPWH consultants in the preparation of design plans on road projects.

Among the technical requirements of the DO include: street lights must be uniform and free from dark bands or abrupt variations; could be high pressure sodium (HPS) or light emitting diode (LED) lighting; color temperature can vary between warm white and warm yellow and the use of ultraviolet light is prohibited; suitable for outdoor use and rated as ingress protection (IP) 65 per International Electrotechnical Commission (IEC).

For primary national roads, light arrangement may vary from single, axial, opposite, or staggered; secondary roads may use single, opposite, or staggered lighting arrangement; while tertiary roads may use single or staggered lighting arrangement.

The DO also sets lamp wattage, mounting height, spacing, use of pole arms, depending on road classification, width, number of lanes, and taking into consideration intersections and merging sections that require higher level of illumination to ensure there is enough light sources on the traveled path. (dpwh/pia-ncr)