Optimizing signal timing is considered a low-cost approach to reducing congestion. Based on data from six separate studies, the costs range from $2,500 to $3,100 per signal per update. While this range is reasonable, costs could be slightly more or less.
An executive agreement is an agreement entered into between a foreign government and the executive branch of the United States. Although the agreement binds the United States with as much force as a treaty, it is not as formal as a treaty and does not require Senate approval.
So, a treaty is a kind of executive agreement, one in which two thirds of the senate has provided advice and consent.. That language comes from Article II, Section 2, Clause 2 of the Constitution. This clause defines the procedure and authority for creating treaties. Its text: