TomTom Go shows different speed limits to what’s returned by api

REST APIs
#1

Seems there is inconsistency between speed zones returned by TomTomgo app when in same car as a device I am issuing the Api to retrieve speed limits by sending lat : long

Some times they change at same time other times there can be delays of 10-60 seconds and other time totally different that so don’t change for kilometres before both tomtotmgo and the device with api are showing same limit

#2

Do you use heading param in your API requests?
Sometimes the service can provide false data when the GPS location is not precise or very close to other roads or directions.