Improving highway advisory radio predictability and performance

Details

• Corporate Creators:
  CTC & Associates LLC
• Subject/TRT Terms:
  • Highway communications
  • Research
  • Radio
  • Receivers and reception
  • highway advisory radio
  • trt
• Resource Type:
  Tech Report
• Geographical Coverage:
  California
• Corporate Publisher:
  California. Department of Transportation
• Abstract:
  Highway Advisory Radio (HAR) stations, sometimes referred to as Travelers’ Information Stations (TIS), ; allow highway agencies to broadcast important messages about traffic, weather and roadway conditions to ; motorists. Caltrans has deployed HAR stations across the state, but performance is often unpredictable, ; with signal strength often failing to meet the state’s intended design criteria. ; Caltrans sought to better understand the underlying design factors involved with HAR signal ; transmission. The agency wanted to know what research, guidelines, specifications or practices among ; other agencies were available to improve the design and deployment of HAR stations. Caltrans’ ultimate ; goal is to achieve more uniform and predictable signal strength and quality. ; This Preliminary Investigation is limited in scope to AM band HAR stations and is focused on design ; factors related to radio wave propagation; topography; environmental characteristics (geology, ground ; conductivity); relevant system components and configurations (antennae, grounding); and related factors ; affecting HAR performance.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27699/dot_27699_DS1.pdf
• File Type:
  [PDF - 9.58 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:e0f215a7c66a7c497a465cbe391f9a241da4114e4ab7c1909cd04cc25041a3e4