The present invention provides for a hurdle having an upright position and a collapsed position, the hurdle comprises a crossbar and a pair of legs pivotally connected to the crossbar. Each leg has a proximal end and a distal end where the proximal end is pivotally connected to the crossbar end and the distal end is for placement on an exercising surface. The distal ends of the legs can be rotated away from the bottom surface of the crossbar in an expanded upright position. In an upright position the hurdle provides height relative to the exercise surface which can be adjusted by a pivot angle between the crossbar and legs. When the hurdle is in a collapsed position the legs are substantially parallel to the crossbar. In another embodiment the crossbar of the hurdle can be used as a rung in an exercise agility ladder.

The present invention provides a drone-passing multiple detection sensor gate comprising: a gate having a ring-like structure through which a drone can pass during flight; a first sensor, disposed on the front or the inner front of the gate, for detecting whether the drone approaches the gate or passes through the front side of the gate; a second sensor, disposed on the inner rear of the gate, for detecting whether the drone sensed by the first sensor passes through the rear side of the gate; a detection signal transmitter, disposed inside or on a surface of the gate, for receiving, from the first sensor and the second sensor, the detection signal indicating whether the drone approaches or passes through the gate, and wirelessly transmitting the detection signal. In addition, the present invention provides a drone game system using a multiple detection sensor gate.

A publicly accessible urban beach entertainment complex is disclosed, with a man-made tropical, pristine-clear lagoon as the centerpiece of the complex. The lagoon includes a surf feature and surrounding the lagoon are entertainment, educational, sports, and commercial facilities. The complex has a controlled public access and provides the look and feel of a tropical beach with clear waters and sandy beaches. In addition a method for efficiently utilizing facilities and land that are vacant, underutilized, have limited uses, or that are contiguous to or nearby recreational, educational, sports, or commercial venues is disclosed. The method providing a publicly accessible urban beach entertainment complex with a centerpiece man-made tropical-style pristine-clear lagoon having a surf feature. The method allows for generating revenue and increasing efficiency by pairing vacant sites, underutilized sites, limited use land, or sites that are contiguous to entertainment, educational, sports, and/or commercial venues with urban beach entertainment complexes. The complex preferably has a controlled public access, thereby allowing entrance upon payment of a fee.

A method for determining split times in a relay race run using one or more lanes of a running track, where a relay team in each lane carries a respective relay baton, includes, for each lane: (a) periodically determining a location of the respective relay baton, (b) determining, for one or more take-over zones in the lane, respective first times when the relay baton crosses a respective line within the take-over zone, (c) determining a second time when a finish line of the relay race is reached, and (d) determining a split time for each segment of the relay race, based upon a start time of the relay race, the one or more first times, and the second time.

A method for determining split times in a relay race run using one or more lanes of a running track, where a relay team in each lane carries a respective relay baton, includes, for each lane: (a) periodically determining a location of the respective relay baton, (b) determining, for one or more take-over zones in the lane, respective first times when the relay baton crosses a respective line within the take-over zone, (c) determining a second time when a finish line of the relay race is reached, and (d) determining a split time for each segment of the relay race, based upon a start time of the relay race, the one or more first times, and the second time.

Aspects may define a race course using a plurality of gates each including a fiducial marker that encodes a location, an ordering, and a pose of the corresponding gate. Each of the gates may include an opening through which robotic vehicles participating in a race may traverse, and a flight path may be defined through the opening of the gates. Each fiducial marker may be displayed around a perimeter of the opening of a corresponding gate, and may include a unique pattern that conveys the location, ordering, and pose of the corresponding gate to video cameras provided on the robotic vehicles. A pilot may use the fiducial markers presented on the gates to navigate the robotic vehicle through the race course, for example, so that the pilot may not need to rely solely upon the first-person view provided by the streaming video transmitted from the robotic vehicle.

Aspects may define a race course using a plurality of gates each including a fiducial marker that encodes a location, an ordering, and a pose of the corresponding gate. Each of the gates may include an opening through which robotic vehicles participating in a race may traverse, and a flight path may be defined through the opening of the gates. Each fiducial marker may be displayed around a perimeter of the opening of a corresponding gate, and may include a unique pattern that conveys the location, ordering, and pose of the corresponding gate to video cameras provided on the robotic vehicles. A pilot may use the fiducial markers presented on the gates to navigate the robotic vehicle through the race course, for example, so that the pilot may not need to rely solely upon the first-person view provided by the streaming video transmitted from the robotic vehicle.

Aspects may provide navigation assistance to guide a robotic vehicle through a course defined by a plurality of gates each including a fiducial marker that encodes a location, an ordering, and a pose of the corresponding gate. In some implementations, an optimal trajectory may be generated through the course and used to determine whether to provide navigation assistance to the robotic vehicle. The optimal trajectory may include a reference path that extends through openings formed in center portions of the gates, and may be used to create a virtual tunnel indicating a maximum distance that the robotic vehicle may deviate from various points along the reference path. If the robotic vehicle deviates from the optimal trajectory by more than the distance while traversing the course, navigation assistance may be provided to the robotic vehicle.

A tunnel for mounting above a road surface (3) comprises a plurality of tunnel segments (1). Each tunnel segment is adapted for mounting at least one projector (6) therein, above a respective opening formed by the tunnel segment in a ceiling of the tunnel. The openings (5) of the plurality of tunnel segments are spaced apart in succession in a direction of travel of vehicles in the tunnel. The tunnel segments are disposed such that projection surfaces (8) of the projectors are seamlessly contiguous or overlapping on the road surface in the direction of travel. The tunnel may comprise awnings positioned at its entrance and its exit, the ceiling being formed at least in part by the awnings. A first awning (10A) may be mounted to a first tunnel segment, in the direction of travel, and a second awning (10B) may be mounted to a last tunnel segment, in the direction of travel.

The present invention provides for a training ladder, hurdle and methods of using the same. The ladder comprises flexible substantially parallel stiles, two spaced apart rungs between the stiles, each rung having a first and a second end for connection to the stiles; at least one rung having a clasp at each rung end to connect the rung to the stiles. Each clasp has an open and closed position. In the closed position, the rung with the clasps cannot be moved along the stiles and in the open position the rung can be repositioned or removed from the stiles. The present invention additionally comprises a hurdle. Advantageously, the legs of the hurdle are pivotally connected to a crossbar providing for adjustable height and preferred storage methods. Optionally, the crossbar of the hurdle can be configured from a rung of the ladder.