What is the width standard of highway lane in our country?

There is a national standard for the width of each motor vehicle lane on highways. The width of each motor vehicle lane on multi lane highways above grade three is 3M. There is no unified standard for the central isolation belt. The width of the simple cement central isolation belt is 1m (the distance between the white solid lines on both sides of the central isolation belt). If it is a central green isolation belt, it is difficult to say the width, Some "image project" roads can be tens of meters wide. Generally, there is no sidewalk on the roads between cities and towns (generally only when they pass through the city). The sidewalk must be set on the urban trunk road. According to the actual flow of people, the sidewalk on the urban trunk road is generally at least 3 meters wide, and the width can reach 15-20 meters
For a class I highway with a red line of 26 meters, it is generally like this: the two-way six car road is 18 meters, the central isolation belt is 1 meter, the shoulders on both sides are 1.5 meters, a total of 3 meters, and the remaining two sides are 2 meters for drainage ditch and other supporting facilities
An 80 meter red line urban primary trunk road can be generally divided into two-way eight lanes of 28 meters (3.5 meters for each motor vehicle lane on urban trunk road), central green belt of 5 meters, green belt between motor vehicle lanes and non motor vehicle lanes of 3 meters on both sides of 6 meters, non motor vehicle lanes of 5.5 meters on both sides of 11 meters, and sidewalks of 15 meters on both sides of 30 meters

What is the standard width of provincial highway lane

According to the administrative level, highways are divided into national highway, provincial highway, county highway, township highway and village highway. According to the function and traffic volume, highways are divided into the following five levels: 1. Expressway & nbsp; 2. & nbsp; first class highway & nbsp; 3. & nbsp; second class highway & nbsp; 4. & nbsp; third class highway 5. & nbsp; fourth class highway, The width is different according to the design speed, as shown in the table below:

What did Armstrong and Aldrin do after last month?

The lunar soil and rock samples were collected. The U.S. satellite streak phase was inserted. The landing condition of the lunar lander was checked. A call was made with U.S. President Nick. A lunar monument was set up. Various scientific exploration instruments were installed
My hands are sore,

8 meters of residential buildings, stairwell size in general?
I calculated that 2.6 * 4.8 (axis spacing) should be OK. Why do I see that the depth of all units is 5.1 meters
What if the height of the story is 3 meters? What is the appropriate size of the staircase?

It's not a problem. It's also a common specification. The requirement of stairs in residential buildings is not less than 4.5m, the net width is not less than 2.4m, and the width of tarmac is not less than 1.2m (including the upper platform)
They all meet the requirements of the specification
Just adjust the height. If it's too high, it depends on the specific situation

American astronauts Armstrong, Collins and Aldrin finally visited the moon on behalf of all mankind

Land safely

It is known that the height of a residential building is 2.8m, the number of floors is 6, the width of staircase is 2.7m, the depth of staircase is 5.4m, and the height difference between indoor and outdoor is 450mm
1. The entrance and exit of the residence is set under the middle platform of the ground floor, and the design of the first floor stairs must meet the minimum clear height requirements. 2. Stair plan and section plan: draw the plan of the bottom floor, the second floor, the standard floor and the top floor of the stairs, with the scale of 1:20. Section plan: draw the section of the stairwell, with the scale of 1:50 3, and 3-4 detailed structural node drawings of the stairs, Two dimension lines and stair steps must be marked in the drawing, the elevation of floor and platform must be marked in the section icon, and the lines, lines and cutting symbols in the drawing shall be expressed according to the architectural drawing standard
Font: imitation song style, with a 2 ᦇ picture to complete

This will take some time, not enough

When Armstrong and Aldrin landed on the moon, what happened to that church bell?
But I heard that there is no air on the moon, so what is the sound transmitted through?

It is said that the moon is hollow
Concussion echo after impact

It is known that a residential building is a 6-storey brick concrete structure, 8m in height, 600mm in height difference between indoor and outdoor, 2.7m in staircase, 5.4m in depth, and 240mm brick walls
Help design a staircase! Finally, there are specific formula algorithm!

When walking 16 steps, the height of the step is 175mm, the width of the ladder can be set between 1100mm and 1200mm, and the width of the rest platform should be greater than or equal to 1200mm, and not less than the width of the ladder

What is the name of the US manned spacecraft to the moon on July 20, 1969? What is the world-famous saying he said

Apollo 11 is the fifth manned mission in the Apollo program of NASA. It is the first human lunar mission. The three astronauts who perform this mission are divided into three groups

There is a 20 storey residential building with 19 steps between every two floors. A goes up the stairs from the second floor, three steps every two seconds, and B goes up the first floor from the 15th floor
Straight down, walk 5 steps every 3 seconds. How many seconds do a and B meet

From the 2nd floor to the 15th floor, there are steps (15-2) × 19
If a walks 3 steps every 2 seconds, he will walk 3 / 2 steps every second
If B walks 5 steps every 3 seconds, he will walk 5 / 3 steps every second
So how many seconds did a and B meet: (15-2) × 19 △ 3 / 2 + 5 / 3) = 78 seconds

What is the width standard of highway lane in our country?