Variable traffic safety sign for displaying roadbed conditions in response to changes in temperature and humidity
US9790652B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2016 |
| Grant date | Oct 17, 2017 |
| Priority date | — |
| Expiry date | Nov 29, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2007/1878
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A variable traffic safety sign is useful in informing road users of the possibility of a surface of a road or bridge section being wet or frozen without using an additional external power source by exactly expressing freezing and wet roadbed conditions of the road or bridge section using a thermochromic paint and a humidity indicator paint, and also allowing road drivers to exactly recognize the roadbed conditions of the road or bridge section by displaying the freezing and wet roadbed conditions of the road or bridge section conditions in response to changes in temperature and humidity, respectively. Also, the variable traffic safety sign is readily applicable to structures such as a bridge crash barrier, a traffic safety sign board, a bridge guardrail, a road shoulder, and an inner part, entrance and exit of a tunnel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.