A 2 lane rural highway usually has a minimum of 4' shoulders, where there is room. For this roadway, the average width is 30 feet. A 2-lane residential street may only have 2 12 foot lanes with curb and gutter. It is not unheard of to have a 24' wide roadway plus curb and gutter.
Mullioned windows are windows which are divided into adjacent panes with the use of mullions, which are vertical elements used to break up a space. Mullions are especially associated with Gothic design, and some very fine examples of mullioned doors and windows can be seen in Gothic cathedrals and homes.arger mullioned windows may be used to illustrate a brief story or allegory, especially in church architecture. In this sense, the windows are more decorative than functional, since the stained glass obscures the flow of light into the building.
When dividing adjacent window units, its primary purpose is to provide structural support to an arch or lintel above the window opening. Its secondary purpose may be as a rigid support to the glazing of the window.When used to support glazing, they are teamed with horizontal supporting elements called  transoms .In the commercial door industry, the term floating mullion is also applied to an interlock profile which is fitted in between a pair of double swing doors. mullion acts as a structural member, in most applications the mullion transfers wind loads and weight of the glazing and upper levels into the structure below. Although in the instance of a curtain wall screen, the mullions only support the weight of the transoms, glass and any opening vents installed.