Everyone quickly dealt with the accident, but fortunately the damage was not very large. Liu Bang and Xiao He were in a hurry to rush to Pei County, and Lu Wen gave his carriage to Xiao He and Liu Bang. Xiao He was very grateful for letting Taigong Lu have time to come to Pei County as a guest, and said goodbye to Li Tangshan and Zhao Tuo one by one.

The horse team arrived in Baoji very smoothly, Li Tangshan and Lu Pheasant agreed to come to Lu Pheasant after the work was completed, and Lu Wen sent Lu Pheasant's mother and daughter back to their parents' home.

Baoji is the Chencang of the dark Chencang, the ancient Chencang is the hometown of Emperor Yan, the birthplace of Zhou and Qin culture, with a long history and splendid culture. In the 5,000-year history of Chinese civilization, it has an extremely splendid and brilliant cultural accumulation. As the ancestral source of Chinese civilization, Baoji has a unique character that must be faced in the whole country due to its lofty historical status and unique nature of cultural inheritance. Guchencang is also a literary hot land accompanied by China's 5,000-year-old splendid civilization history, and has been an important literary town of the Chinese nation throughout the ages. The Book of Songs, the originator of Chinese literature, was born in this historical holy place full of wisdom and profound cultural accumulation; The Book of Han and brocade palindromic poems, these popular pinnacle works, have had an incomparably important impact on the civilization process of the Chinese nation; Li Bai, Du Fu, Su Dongpo, and Lu You, all of whom are brilliant literary heroes, have left famous works that have been passed down from generation to generation on the long-standing and profound literary fertile soil of Guchencang, making this magical land infiltrate the public and benefit the artistic spirituality of the people.

Li Tangshan, Zhao Tuo and Lu Wen were soon put into on-site work. Qin Shi Huang's travel route tentatively started from Xianyang, traveled west through Longxi County (present-day Lintaonan, Gansu) and Beidi County (present-day Ningxia and eastern Gansu), and reached Jitou Mountain (present-day Pingliangxi, Gansu) in the upper reaches of Jingshui, and then returned to Xianyang after returning to Zhongzhong (present-day Pingliangbei, Gansu).

Baoji's "Jiang City" worship Emperor Yan is indispensable. Emperor Yan cultivated medicine and piano weaving on the banks of the Weishui River in those years. Emperor Yan cultivated the benefits of fire, used fire to dee the king, taught the people to cultivate, tasted all kinds of herbs, began to make clothes, integrated China, and gathered the Quartet. It has made outstanding contributions to the creation of Chinese culture and civilization, and laid the foundation for the rejuvenation and reunification of the Chinese nation. Yandi's invention and creation show the entrepreneurial and dedication spirit of daring to be the first, indomitable, benefiting the people, and striving for self-improvement.

Especially for Li Tangshan, these overseas Hakkas have a deeper affection for Emperor Yan, Li Tangshan has heard that Emperor Yan divides the year into twelve months, and the last month is the wax month. In the last month of the year, sacrifices are made to the gods to thank them for their protection throughout the year and to pray for good weather in the coming year. After the death of Emperor Yan, the Lap Sacrifice gradually became the Sacrifice of the Eight Laps, but it also expressed the people's prayers for a good agricultural harvest.

The official sacrifice to Emperor Yan first began with the Yellow Emperor. It is recorded in the "History of the Road": "The seventieth generation of the Shennong clan has the world, the Xuanlu clan is prosperous, and the Yan Emperor participates in Lu Chan, and the seal participates in Lu Yunan, guarding his ancestors, in order to worship Shennong." ”

After the route of the tour has been planned, preparations are made for the construction of the road.

Li Tangshan drew on some standards for the construction of expressways now, stipulating that the width of the road should be 50 steps, and trees should be planted on both sides, which should be windproof and beautiful. Li Tangshan especially took into account the experience of traffic jams often caused by modern highway holidays, and most of the common people of Qin used slow transportation, which will greatly restrict the high-speed characteristics of the Chidao, and specially stipulated that the Chidao is a special lane for the emperor to patrol and military purposes, and in the event of war, the Chidao can also be used as a supply line for material transportation, so that military supplies can be transported quickly and safely to the front line.

Li Tangshan drew on the experience of modern road construction and combined with the actual situation of the Qin State, and after discussing with Zhao Tuo and Lu Wen, he made a preliminary plan and submitted it to the Qin Emperor to build a gallop road with Xianyang as the center and leading to all parts of the country. With Xianyang as the center, it is distributed in a scattering shape to the surrounding areas. It turned out that Li Tangshan planned to learn from the experience of China's high-speed railway to build a railway, but found that with Thailand's economic strength and technical level, it could not even build a kilometer. Li Tangshan found that everything is more complicated by imagination, and the theoretical basis, the level of technology, mining and smelting technology, and the acceptance of the people fundamentally determine that the application of modern technology in ancient times is impossible to occur, which is all exaggerated imagination and can only change a small part of the people.

Emperor Qin was very satisfied with Li Tangshan's construction plan, and Li Tangshan was also happy to be able to participate in the construction of the most national highway in ancient China. This is also a good thing that "the merit is in the present and the benefit is in the future". Li Tangshan, as the commander-in-chief of the galloping road, led Zhao Tuo to engage in economic construction, and also relied on Li Si's policy of cars on the same track. Li Tangshan considered that in ancient times, cement was not necessary for highway construction, only mud roads and small stones or sand were added. The hardness of dirt roads was very poor, so the vehicle standard was established, and each vehicle had the same distance between the two axles, and most of the vehicles at that time were two-wheeled vehicles. Li Tangshan has designed different vehicles according to different uses, some are suitable for load, some are conducive to speed, and some are light and comfortable. There are also flexible unicycles and four-wheeled vehicles with strong stability and large load capacity. Li Tangshan also added an iron ring to the axle to grind the iron with the iron, and added grease lubrication in the meantime, which not only enhanced the firmness of the wheel, but also reduced the friction of the car bearing, all in consideration of convenient transportation.

After obtaining the approval of Qin Shi Huangdi, the road construction work was immediately carried out, and a large number of migrant workers were recruited from all over the country, and the wool road was first dug up, and then paved with sand and gravel to roll it. The migrant workers use the most primitive tools, such as hoes, shovels, flat poles, straw ropes, etc., and the stones are all taken from the nearest materials. After the construction of the whole line started, almost all the stones that could be moved in the nearby river were fished out, and the rest of the stones mined from the mountains had to be hammered into stone grains to pave the roadbed with iron hammers.

After the gravel is laid, the roadbed must be pressed. The roadbed is also the original method of pulling stone rollers and rolling in layers. A stone mill weighs 3 to 5 tons, and most of them cannot be made nearby, so they must be carried by hand and shoulder, and transported from the mountains and forests. When encountering downhill slopes, the stone mill often generates a huge momentum, causing a large amount of sand and gravel on the ground to roll down.

The road construction project has been going smoothly, and Lu Wen and Zhao Tuo are also busy on the construction site. Li Tangshan formulated the construction process and steps of the filling subgrade for the construction team: organize the construction according to the construction process of three stages, four sections and eight processes.

Three stages: preparation stage, construction stage, renovation and acceptance stage.

Four sections: filling section, leveling section, rolling section, and testing section.

Eight processes: construction preparation, substrate treatment, layered filling, paving and leveling, sprinkling and drying, rolling and tamping, and testing subgrade renovation.

Li Tangshan also stipulates the selection of fill subgrade soil:

1. Gravel soil, sandy soil, blasting stone slag and cohesive soil with water content that meets the compaction requirements can be used as fill soil.

2. Silt, frozen soil, expansive soil and organic matter (remove roots, leaves, etc.) content of more than 8% soil, clay with large water content should not be used as filling.

3. The fill should be filled with the same kind of soil as far as possible. If two kinds of fillers with different permeability are used in the filling, they should be filled in layers, and the upper layer should be filled with filler with less permeability, and the lower layer should be filled with filler with greater permeability. All kinds of soil materials should not be mixed, so as not to form a water bladder in the fill.