The lettering used on all road signs should be made using both lower and upper case letters, with the lower case letters being no more than 2/3rds the height of the upper case letters. The letters used should be of a sans-serif font, containing absolutely no fancy strokes or unnecessary curves or flairs. All letters should be purely simple and constructed with only the fundamentally important strokes essential to forming the letter. Signs using these easy to read fonts should be phased onto all roadways, but especially on those with speed limits over 75 kilometers per hour (47 MPH).