Gaithersburg Traffic Signs Signals and Equip Whol 18960 Woodfield Rd Highway and Safety Services specializes in road construction sales and services, such as traffic control, erosion control, precast concrete, signs, flagger certification classes, and more Gaithersburg MD Traffic Signs Signals and Equip Whol Highway and Safety Svc Inc www.hiwayandsafety.com flagger flagging certification class course traffic control highway safety services hiway road construction pavement striping guardrail equipment fencing maintenance vests hard hats hardhats cones drums measuring wheels brick pavers stormwater storm flagger flagging certification class course traffic control highway safety services hiway road construction pavement striping guardrail equipment fencing maintenance vests hard hats hardhats cones drums measuring wheels brick pavers stormwater storm Business Reviews Highway and Safety Svc Inc Testimonials