Route with same direction

sameDirection.js

/*
* Starting from two route, this algorithm, verify if they are the same direction.
* The computeHeading function is defined in https://gist.github.com/jesty/7b2a8e31d56c13a6adff
*/
var sameDirection = function(startA, endA, startB, endB){
	var headingA = computeHeading(startA, endA);
	var headingA = computeHeading(startB, endB);
	return Math.abs(headingA - headingA) < 45
};