For the needs of stopping sight distance in curve outside of median divider in freeway, ensuring the driving safety, based on the properties of motorcar running on passing lane, this paper analyzed the sight point position and lateral clear distance of curve in passing lane outside of median divider in freeway.

On the basis of the properties of motorcar running on passing lane,the sight point position and lateral clear distance of curve in passing lane outside the median divider in expressway are analyzed.

In this paper, the authors introduce a method of calculating transverse sight distance of a random point which belongs to plane curve.

Research purposes: Aims at the ground movement distribution and transformation during parallel shield tunnel construction,infections on the ground movement value due to effective factors(such as surrounding soil condition,tunnel covering thickness,clear distance and advance force etc) are also probed in.

Several main issues such as withstand voltage correction,equipment external insulation,air clearance,creepage distance and pollution influence,are discussed in this paper by taking an example for external insulation design of Xingren converter station.

In order to research the median safety lateral clearance of expressway,the speed data of overtaking lane and respective inside clearances data of vehicles were collected on some typical sections expressways.