关于Waypoint API新增参数及路线时长问题的技术问询

Great question—let’s break down both your concerns with practical, actionable insights:

1. Adding Parameters like Speed Limit, Vehicle Height/Width #

Most modern routing APIs (including Waypoint’s) offer vehicle-specific parameters for truck routing, which are critical for accurate, compliant routes. Here’s what to do:

• Vehicle dimensions: First, check Waypoint’s API documentation for truck profile-specific parameters—you’ll almost certainly find options like vehicle_height (in meters/feet) and vehicle_width. Including these tells the API to avoid roads with height/width restrictions, which not only keeps your route legal but can also cut down on unnecessary detours that inflate duration. Example code snippet:

  # Example request with truck dimensions
  route_response = waypoint_api.create_route(
      origin="Boston, MA",
      destination="Providence, RI",
      profile="truck",
      vehicle_height=3.6,  # ~11.8 feet
      vehicle_width=2.4     # ~7.9 feet
  )
  

• Speed limits: While some APIs let you set a global max_speed parameter, Waypoint may handle this via profile-specific speed models. If you need to enforce custom speed limits for specific segments, you might need to post-process route data to adjust durations, or submit a feature request to their team if this functionality is missing. Be sure to explain your use case (e.g., "We need to account for company-wide speed policies to get accurate ETAs") to help them prioritize.
• If these parameters aren’t available yet, reach out to Waypoint’s support team with a detailed feature request—real-world use cases like yours often drive API updates.

2. Fixing Duration Discrepancies Between Truck & Car Profiles #

The gap you’re seeing usually stems from default speed assumptions in each profile:

• Truck profile overestimates duration: It uses conservative speed models (accounting for lower truck speed limits, mandatory rest stops, and restricted roads) which can lead to longer-than-necessary ETAs if your truck doesn’t need to follow those constraints. Fix this by:
  • Adding the vehicle dimension parameters above—this ensures the API doesn’t route you on avoidable detours.
  • Checking if the API supports a speed_multiplier for trucks (a common feature) to tweak the default speed model (e.g., setting it to 1.05 if your truck safely travels slightly faster than the default assumption).
• Car profile underestimates duration: It often uses idealized speed data (ignoring real-time traffic, stop signs, or urban congestion). To make car durations more accurate, enable real-time traffic data in your request if Waypoint offers it, or manually adjust for average urban speed reductions.
• If the discrepancy persists for specific routes, share the exact origin/destination pair with Waypoint’s support team—they can debug why the routing algorithm is producing unexpected results.

内容的提问来源于stack exchange，提问作者Gijsbert van Bochove