An energy harvesting system can comprise an actuator comprising a translationally displaceable surface, the translationally displaceable surface being configured to transition from a first position to a second position upon contact by a movable unit; a vertical rack in contact with the actuator, and configured to be translationally displaced in response to translational displacement of the actuator; a pinion configured to engage with the vertical rack and to rotate in response to translational displacement of the vertical rack; a main shaft coupled to the pinion and configured to rotate with rotation of the pinion; and a flywheel and a generator coupled to the main shaft, wherein rotation of the main shaft generates mechanical energy stored by the flywheel, and wherein the generator is configured to generate electrical energy from the mechanical energy stored by the flywheel.

In some embodiments, a directional surface marking may provide directional messaging to users based on their direction of travel on a base surface, such as a roadway, walkway, or interior flooring, as non-limiting examples. In some aspects, the directional messaging may comprise different colors, text, or symbols, wherein a user may view different directional messaging on a directional surface marking dependent on direction of travel. In some embodiments, directional surface markings may comprise a profile layer, wherein the profile layer may comprise a plurality of profiles, which may provide a topography that allows for directional messaging utilizing surface colors on the topography.

In some embodiments, a directional surface marking may provide directional messaging to users based on their direction of travel on a base surface, such as a roadway, walkway, or interior flooring, as non-limiting examples. In some aspects, the directional messaging may comprise different colors, text, or symbols, wherein a user may view different directional messaging on a directional surface marking dependent on direction of travel. In some embodiments, directional surface markings may comprise a profile layer, wherein the profile layer may comprise a plurality of profiles, which may provide a topography that allows for directional messaging utilizing surface colors on the topography.

A cargo carrier for portable rumble strips is mountable to a hitch assembly for a vehicle. The cargo carrier includes a basket configured to receive and retain a portable rumble strip for storage and transport, and a mounting assembly that includes a pintle adapted to be received in a receiver of a hitch assembly mountable to a vehicle. The basket has a frame that includes frame elements that define a bottom wall, relatively long front and back walls, and relatively short side walls that connect the front wall and the back wall. The front, back, and side walls extend from respective sides of the bottom wall in a common direction. And the basket further includes a rotating element at the top of at least one of the side walls to facilitate drawing rumble strips lengthwise over the side wall into or out of the basket.

A cargo carrier for portable rumble strips is mountable to a hitch assembly for a vehicle. The cargo carrier includes a basket configured to receive and retain a portable rumble strip for storage and transport, and a mounting assembly that includes a pintle adapted to be received in a receiver of a hitch assembly mountable to a vehicle. The basket has a frame that includes frame elements that define a bottom wall, relatively long front and back walls, and relatively short side walls that connect the front wall and the back wall. The front, back, and side walls extend from respective sides of the bottom wall in a common direction. And the basket further includes a rotating element at the top of at least one of the side walls to facilitate drawing rumble strips lengthwise over the side wall into or out of the basket.

A system for retrieving a portable rumble strip from a roadway includes a carrier mountable to a vehicle for transporting retrieved portable rumble strips and a winch mountable to the carrier. The carrier has a support surface configured to support a rumble strip. And the winch includes a rotatable drum and a lead with a major dimension being a length dimension. A proximal end of the lead is connected to the drum such that rotation of the drum winds the lead about the drum. A hook is connected to a distal end of the lead opposite the proximal end. The hook is configured to engage and hold a portable rumble strip as the drum rotates to draw the lead and the hook to the winch, thereby drawing the engaged portable rumble strip into the carrier.

A roadway warning device including a portable rumble strip that includes high-density filler material to achieve a desired overall density and roadway stability of the rumble strip such as for use in high-speed traffic conditions without the use of conventional rigid metal ballast inserts. In some embodiments, the filler is dispersed and embedded within a flexible polymer composite matrix of the rumble strip body. In some embodiments, the filler is in the form of discrete unbound pieces of material disposed within a cavity of the rumble strip body. In some embodiments, the filler is in the form of a frangible article disposed within the rumble strip body.

A roadway warning device including a portable rumble strip that includes high-density filler material to achieve a desired overall density and roadway stability of the rumble strip such as for use in high-speed traffic conditions without the use of conventional rigid metal ballast inserts. In some embodiments, the filler is dispersed and embedded within a flexible polymer composite matrix of the rumble strip body. In some embodiments, the filler is in the form of discrete unbound pieces of material disposed within a cavity of the rumble strip body. In some embodiments, the filler is in the form of a frangible article disposed within the rumble strip body.

An automated rumble strip assembly includes a frame having a top surface configured to support a vehicle tire moving along the frame. The automated rumble strip assembly also includes a plurality of elongate members disposed within the frame, wherein each elongate member includes an elongate member housing, an internal carriage assembly disposed within the elongate member housing and moveable within the elongate member housing, and an actuator assembly coupled to the internal carriage configured to move the internal carriage relative to the elongate member housing.

An automated rumble strip assembly includes a frame having a top surface configured to support a vehicle tire moving along the frame. The automated rumble strip assembly also includes a plurality of elongate members disposed within the frame, wherein each elongate member includes an elongate member housing, an internal carriage assembly disposed within the elongate member housing and moveable within the elongate member housing, and an actuator assembly coupled to the internal carriage configured to move the internal carriage relative to the elongate member housing.