The yellow line in the middle of the road, which is naturally the dividing line, was designed to avoid head-on collisions between vehicles traveling in the opposite direction, and it is said that since the introduction of the yellow line in the middle of the road, the traffic accident rate has decreased a lot, and it has quickly become popular. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

Although Datang's vehicles are horse-drawn carriages, the speed of driving is relatively low, and the probability of a head-on collision is relatively low, but the work of road specifications must still be done in advance, after all, the steam freight truck has begun to be put into use, and in the future, the steam passenger vehicle will also appear, so the speed must be faster than the horse-drawn car, and once the collision occurs, it is a relatively large accident.

In addition, when there is no median line rule, the powerful often occupy the entire road surface, and oncoming vehicles and pedestrians must retreat to the side of the road, or even into the fields next to the road, causing great damage to the crops in the fields, and this situation must be stopped.

"Your Majesty, the yellow line in the middle of this road is the pedestrian dividing line, pedestrians and vehicles leaving the city take the right side of the yellow line, and pedestrians and vehicles entering the city go to the left, and people and vehicles on both sides cannot cross the yellow line, so that many accidents can be avoided, and the powerful and the people can be avoided from arguing, reflecting the love of the people of the imperial court."

Ang Lee opened his mouth to explain.

"Well, Li Shilang's yellow line is set well, so that the occurrence of disputes can be reduced, and the will of the people will be spread that in the future, officials and nobles are not allowed to compete with the people, and everyone must travel on the right, as long as the road is wide enough, it must not exceed the middle line."

Li Longji opened his mouth and issued a holy decree, and the ministers hurriedly opened their mouths to respond.

After all, in many remote areas, the road can only barely accommodate a carriage, if you go to the right, it is difficult for the carriage to walk, of course, this is another situation, and with the gradual popularization of cement and concrete, in the future, many major roads in Datang will be paved with concrete pavement, and as long as it is a road above the county level, there must be a width of more than three carriages to meet the two carriages in the opposite direction.

The concrete pavement is very strong, with Datang's current carriages and pedestrians and horses, even if they walk on it day and night, it will not cause the slightest damage to the concrete pavement, such a hard pavement can be maintained for hundreds of years without damage, and small cracks and sinking uplifts can be repaired quickly.

With the follow-up steam freight vehicles on the road, the damage to the road surface may be greater, but Datang's manufacturing capacity is very limited, a small number of freight vehicles, will not cause much damage to the concrete pavement, besides, as long as the time is ripe, Li An will invent tires, and the development of tires requires rubber materials, that is, plants native to South America, to go to South America and bring back rubber seedlings, which will take many years, that is, to invent rubber, it will take many years, For the time being, I can only use iron wheels.

After walking a few hundred steps, Li Longji and his ministers boarded the wide concrete bridge.

This bridge adds a lot of steel materials as a skeleton, the degree of solidity is far beyond the general stone bridge, and the design is also more atmospheric and luxurious, the bridge deck in addition to the necessary to prevent thermal expansion and contraction of the stripes, but also carved a large number of dragon and phoenix patterns, looks quite spectacular, most of them, in the middle of the position, can be used to separate pedestrians.

On both sides of the bridge are concrete guardrails, and the sides of the guardrails are also carved with a considerable number of various patterns, and on the top of the guardrails, lions and various mythical beasts are also carved, which looks very domineering.

Of course, what surprised Li Longji and the ministers the most was that such a large-scale concrete bridge was completed in only half a month, and there was nothing to say about the quality or scale.

"This concrete bridge is much faster than the construction of a stone bridge, and it was completed in only half a month."

"Will there be a problem with the quality if the construction is completed so quickly?"

Several ministers talked to each other, and Li Longji looked at Li An and motioned for Li An to introduce the specific situation of the bridge.

"Your Majesty, the concrete bridge is not only fast to build, saving costs and manpower, but also much stronger than the stone bridge, can bear greater weight without collapsing, is very suitable for replacing the stone bridge, in addition, with this technology, it can be realized to erect bridges on the Yellow River and the Yangtze River, so that the moat becomes a smooth road, in the future, the railroad track can be directly paved to all the states and counties of Datang."

Ang Lee opened his mouth to introduce.

"How is it possible that Li Shilang actually wants to build bridges over the Yellow River and the Yangtze River."

"The Yellow River and the Yangtze River are several miles wide, even more than a dozen miles."

"The Yellow River is rushing and surging, how can the bridge stand on it."

The ministers were shocked when they heard this, and they all thought that Li An was crazy, even if the concrete bridge was stronger than the stone bridge, but they could not arrogantly think that it was too difficult to build bridges on the moats such as the Yellow River and the Yangtze River.

Li Longji also looked at Li An with a solemn face: "Li Shilang, do you really think that you can build a bridge over the river, how sure are you?" ”

"Your Majesty, as long as there are enough manpower, materials, and technology accumulation, it is completely possible to build a bridge on the Yangtze River and the Yellow River, but it takes a lot of time to accumulate technology and materials to prepare, and if you want to build a bridge on the Yellow River and the Yangtze River, it will take at least three or five years! Wei Chen felt that he could first build concrete bridges on rivers that were not too wide, such as Luoshui, the Grand Canal, and Jishui, in order to accumulate technology, and at the same time facilitate the laying of railroad tracks to the east of Mount Tai in Laizhou and Mizhou, so that His Majesty could reach Mount Tai in a few days if he wanted to go to Mount Tai. ”

Li An opened his mouth to introduce and said the next step of the railroad laying plan, that is, starting from Luoyang City, laying it all the way east, and after crossing a large number of water systems, it arrived at the junction of Mizhou and Laizhou.

There is a large bay there, which is very suitable for a seaport, that is, Jiaozhou Bay in later generations, and Ang Lee chose to lay the railroad tracks to Jiaozhou Bay, intending to build a large seaport there to build large steam ships to serve the next marine strategy.

"It turns out that Li Shilang's next step is to lay the railroad tracks to Mizhou and Laizhou, and it would be great if it could really be repaired."

"Whether the railroad tracks can be successfully paved to Mizhou and Laizhou depends on whether the bridges along the way can be successfully built."

"Yes! Without the construction of these bridges across the canals, it would be difficult for the tracks to be paved to the east. ”

"I'm afraid it's not easy! Although the Luo River and the Grand Canal are not as wide as the rivers, they are not narrow! If you want to build a bridge on it, I'm afraid it's not easy. ”

"I think it's feasible, since Li Shilang is determined, these bridges should be able to be built."

"Even if the bridge can be built, how to ensure the passage of ships, especially the Grand Canal, is the top priority of Cao Yun, if the bridge blocks the ships from traveling, then Cao Yun will be scrapped, and some gains outweigh the losses!"

"Eh, since Li Shilang has proposed to build these bridges, he must have considered this a long time ago, and it will definitely not affect Caoyun."

"Yes, yes, Li Shilang didn't surprise me this time, this time, I will definitely be able to lay all these bridges successfully."

When the ministers heard that Ang Lee was going to build a large number of bridges along the way, they all whispered about the future of laying railroad tracks.

"Li Shilang, these rivers along the way are not narrow, how sure are you?"

Li Longji asked with a solemn face.

In addition to the two major river systems, Luoshui, the Grand Canal, and Jishui are not narrow, especially Jishui, the downstream width is nearly two miles, and it must not be easy to build a bridge on it, at least, Li Longji didn't dare to think about it, and was shocked and puzzled by Li An's plan.

"Your Majesty, Weichen is 100% sure that he will be able to repair these bridges, first build the narrowest bridge to accumulate experience, and the last step is to repair the Jishui Bridge, as well as the Huai River in the south of the Yangtze River, and the bridge will be built in the future."

Ang Lee replied confidently.

Of course, Li An's ability to say this with such confidence is that he has the strength to use it as a confidence, concrete, steel and steel have come out, as well as various basic machinery, as long as he spends time researching and cultivating a bridge-building team, it is not a problem.

"Since Li Shilang is so confident, I also hope that bridges can be built on these rivers, but this must not be interfered with water transportation."

Li Longji is still quite supportive of these big projects, after all, these projects can benefit thousands of generations, and Datang currently has such national strength, of course it will be built.

"Yes, Your Majesty, Weichen will form a team dedicated to building bridges, and all the big bridges in Datang will depend on this team in the future."

Li Ang happily accepted the task and prepared to form such a bridge-building team as soon as he returned.

After crossing the concrete bridge, on the left side of the road is a large pavilion, which is larger than other pavilions, and there are dozens of concrete stone benches in it, which can accommodate more people to rest together, and it is more suitable for sheltering from the rain.

On the right side of the road, there is a two-story concrete building, which is no problem for living.

Li Longji and the ministers first walked around the pavilion, asked about the cost, and then went to the two-story building, and climbed to the small platform on the second floor, looking down on the surrounding scenery.

"Your Majesty, this concrete pavilion and house are much stronger than wood, and the sword can only hurt its hair, but cannot move its roots, and in the end, the concrete cannot be burned, and there is no need to worry about being burned by the fire."

Ang Lee introduced the advantages of concrete buildings.

"A house that is not afraid of fire, good, very good."

Li Longji was very satisfied with the concrete structure of the house, paused, and asked: "How many layers can be built with such concrete prevention?" ”

"Back to Your Majesty, as long as the financial resources are sufficient, the labor and materials are sufficient, there is no pressure to build a hundred floors, and it is extremely strong, and it will definitely not collapse."

Ang Lee had no choice but to answer.

"A hundred floors, how can you build a hundred floors?"

"The pagoda in the temple is only a dozen floors, how should this hundred floors be built?"

"Li Shilang said, if you can build a hundred floors, then you must be able to build so high, I believe Li Shilang."

"I really want to see what a hundred-story house looks like!"

The ministers whispered, they couldn't even think of a hundred-story building, after all, it was too high, beyond their knowledge of architecture.

"Li Shilang, can you really build a hundred-story house?"

Li Longji's expression was extremely surprised, with a hint of excitement in his surprise, if he could really build such a tall house, wouldn't he be able to stand on the high-rise and see the scenery of the entire capital, how cool that feeling would be! Moreover, now a hundredfold telescope has also been developed, as long as there is a commanding height, you can completely see the scenery of the whole city, and even what the people in each city are doing.

"Your Majesty, how dare Wei Chen joke that as long as all the materials are sufficient, a hundred-story house can definitely be built, but it really doesn't make much sense to build a hundred-story house, and the cost of materials and manpower is too great."

Ang Lee replied in the affirmative, and at the same time, pointed out that there is no practical point in building a house that is too high, so that Li Longji should not be hot-headed.

"It's not necessary to have a hundred floors, but to build a twenty-story house, you can give it a try, the Taishi Bureau observes the nebula, and you need a higher position, and if you need it in the future, I will let Li Shilang build it."

Li Longji hasn't figured out where to build a twenty-story building, after all, such a tall building is too conspicuous, and he is the emperor of a country, so he has to consider many situations, for example, to build such a tall building, where to place it to reflect the prestige of the Tang Empire, how to avoid being used to observe the palace, how to facilitate himself to climb to the top of the building, and observe the scenery of the capital, these must be considered, who made him the emperor?

After affirming the great role of cement and concrete, Li Longji and the ministers all believed that cement production workshops should be built throughout the territory of Datang, and that all counties should organize manpower to build important roads in the territory during the agricultural slack period, so that the roads at the county level in Datang Prefecture can be concreted, so as to facilitate the travel of the people and promote economic development.

To promote cement workshops, it is necessary to train people in cement manufacturing, and then let them go to various states and counties to build cement workshops, and gradually mobilize manpower to build the main roads in the territory.

Because there are too many states and counties in Datang, there are more than 300 formal states, and more than 1,000 county-level units, and the cultivation of talents of such a scale is too energy-consuming.

Of course, this is only a very ideal state, in the actual operation process, it is certainly not possible to let all states and counties build cement workshops, after all, some states and counties are without raw materials, so, of course, it is not suitable for building cement workshops.