Query speed limit for latitude longitude. Example for I-93: ./get-speed-limit.py 42.589634 -71.163586

get-speed-limit.py

#!/usr/bin/env python3

import requests
import sys
import re

# parse command line arguements
if len(sys.argv) != 3:
    print("Usage: {} latitude longitude".format(sys.argv[0]))
    sys.exit()

lat = float(sys.argv[1])
lon = float(sys.argv[2])
offset = 0.0001  # about 20 meters

# build a box and pass it to the web server
url = "http://www.overpass-api.de/api/xapi?*[maxspeed=*][bbox={:f},{:f},{:f},{:f}]".format(
    lon - offset, lat - offset, lon + offset, lat + offset)

res = requests.get(url)  # query openstreepmaps

# uncomment to see raw data returned
# print("status code:", res.status_code)
# print("xml: ", res.text)

if res.status_code != 200:
    print("bad web request")
    sys.exit()

# search data for the "maxspeed" tag
maxspeed_regex = re.compile(r'<tag k="maxspeed" v="(\d. mph)"')
search_results = maxspeed_regex.search(res.text)
if search_results:
    print(search_results.group(1))
else:
    print("no speed limit data found")