Improving highway advisory radio predictability and performance

Details

• Corporate Creators:
  CTC & Associates LLC
• Subject/TRT Terms:
  Highway Advisory Radio Highway Communications Radio Receivers And Reception Research 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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:e0f215a7c66a7c497a465cbe391f9a241da4114e4ab7c1909cd04cc25041a3e4
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27699/dot_27699_DS1.pdf
• File Type:
  [PDF - 9.58 MB ]