Nkọwa nkenke:

• Aha mmado nke ejiri ihe ndi n’enweghi ike igwusi ma o bu gbagoro ngwa ngwa, nke kwesiri ka odi nkpa ma obu nke ndi ozo.
• Traffolyte na-ejigide agba nke ọma, yabụ ị nwere ike iji akara akara Traffolyte a kanyere agba mgbe ịchọrọ ịdọta uche ma belata ihe ọghọm.
• Zuru okè n'ihi na ma mpụga na esịtidem ngwa n'ihi laminated phenolic plastic ihe nke bụ nnọọ inogide