Answer Wiki. The width of a single travel lane can vary from 10'-12'. The faster the traffic is intended to travel, the wider the lane needs to be. Therefore, city streets with a speed limit of 25-30 mph should have 10' lanes, while highways should have 12' lanes.
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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.