M40 or M-40 may refer to:

In transportation:

In science:

In firearms and military equipment:

See also

The M-40, in Spanish transport, is a Madrid orbital motorway, similar to the M25 motorway in London, or the Boulevard Périphérique in Paris. It is the second-outermost of the Madrid orbital highways, the M-30 being the closest to the centre of Madrid.

Overview

It has a total length of 63.3 km (39.3 mi), looping around Madrid and its suburb Pozuelo de Alarcón at a mean distance of 10.1 km (6.3 mi) to the Puerta del Sol. The actual distance is much closer in the southern and eastern spans, which have been engulfed by the city in some points; than in the west, where the Casa de Campo and the projection towards Pozuelo brings it further from Madrid itself.

Furthermore, it is the only one of the several ring roads serving Madrid that runs as a full-fledged motorway for all its length: a span about 2 kilometres (1.2 mi) long at the northern arc of the inner M-30 are not freeway-grade, having level crossings and traffic lights; while the outermost M-50 is not a full ring road due to the interruption caused by the Mount of El Pardo protected natural zone. With the "normal" M-40 traffic already being one of the heaviest in Spain, this provides for mighty jams in its northern span during peak hours. The Madrid regional government, which built the M-45 motorway external to the M-40 specifically to decongest the southern and eastern spans of the older beltway, has recently aired plans to address the northern jams by effectively "closing" the M-50 ring with a tunnel under the protected area.

M-40 is a north–south state trunkline highway in the Lower Peninsula of the US state of Michigan. The highway runs from US Highway 12 (US 12) near the Indiana state line in Porter Township north through Paw Paw and Allegan to end in the outskirts of Holland. The current northern end is near Interstate 196 (I-196) at an intersection with US 31/Business Loop I-196 (BL 196). In between, M-40 runs through mixed agricultural and forest lands and along lakes and rivers through Southwest Michigan.

The trunkline was designated by July 1, 1919 along with the rest of the original state highway system along a route that is different that of today. South of Paw Paw, the original M-40 reached Niles and even the Indiana state line for a time. The northern end was extended in stages to Holland. The southern end was shifted in the 1970s, resulting in the current routing.

Route description

M-40 starts at an intersection with US 12 in rural Cass County. Running north through farm fields, the highway rounds Bar Lake and into the community of Jones. The area around Jones has a few more lakes in a wooded setting. As the trunkline continues north, it passes back into farm lands. The road curves around to the northwest as it passes between Bogart Lake and Streeters Mill Pond near Dutch Settlement Road. M-40 follows Centre Street into Marcellus. When the highway meets the western end of M-216 in town, M-40 turns west along Main Street and runs out of town. The roadway returns to a northerly course, and later it curves northwesterly again near Cedar Lake near the Van Buren County line.