1. A method at a first computing device within an Intelligent Transportation System for vehicle length reporting, the method comprising:receiving, at the first computing device, a reported position from a second computing device;
finding position information for the first computing device from a position sensor;
determining that a time stamp for the reported position from the second computing device, and a time stamp for the position information for the first computing device are within a threshold time of each other;
calculating a difference between the position found for the first computing device and the position reported from the second computing device; and
using the difference for vehicle length reporting.