CPC B61L 23/06 (2013.01) [G08B 5/006 (2013.01); G08B 6/00 (2013.01); G08G 1/005 (2013.01); H04B 1/3827 (2013.01); H04B 1/69 (2013.01); B61L 1/02 (2013.01); B61L 15/0027 (2013.01); B61L 25/026 (2013.01); H04B 2001/6912 (2013.01)] | 19 Claims |
1. A portable roadway protection system comprising:
a first portable device having a first wireless transceiver
a second portable device configured to be carried by a first rail worker, the second portable device having a second wireless transceiver configured to transmit one or more second signals to the first portable device
a third portable device configured to be carried by a second rail worker, the third portable device having a third wireless transceiver configured to transmit one or more third signals with the first portable device
where:
based on the second and third signals, the first portable device is configured to determine a first distance between the second portable device and the third portable device; and
based on the distance being greater than a threshold distance, the first portable device is configured to transmit an alert signal.
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