Construction renovation in the desired length of r -

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Renovation of the desired length of the road construction to determine

Variable is the maximum possible wait time the two sides. Now,[link widoczny dla zalogowanych], to discuss (7),. Requires a Head of a gz> O practical implications. In fact, it can be described the following results for a g1 a g> O is, g> 1 +2, said the team through the stretch of road as the headway, bighead carp, said road vehicle through rate. Thus, one by one head 2> O is actually required to maintain the opening of the construction sections, the average pass rate of vehicles, the average arrival rate must be greater than the sum of the two sides,[link widoczny dla zalogowanych], otherwise the roads will be gridlock, which in practice is obvious. If this happens, cut the road renovation of the break, road traffic control must be carried out to obtain the desired length and construction of the optimal allocation of travel time. $ Count split 7 'proposed two-lane highways of a road and renovated, and do not interrupt traffic during the construction period required for this, decided to adopt by-stamp way of framing construction. The time interval of 1 minute two-way traffic on the road to continuous observation of two-way traffic flow to obtain the number of vehicles per minute to reach the 120 observations (see Table】),[link widoczny dla zalogowanych], if during the construction vehicles from the fluttering of flag set by the average speed for the road construction 1O km / hour, the car away from the l5 meters, when given a desired maximum vehicle width for the lO-minute wait time, ask each length of road construction should be how much? Table 1 ÷ south north south ÷ 3.1 average to find two-way traffic flow with rates set: south to north direction (referred to as south) is observed sample, the sample mean m, the average arrival rate A | north to south (ig said north) samples is observed, the sample mean for the m2, the average arrival rate as A:, then 60m1 = ΣX ~ / 6O = 26 ~ / 6o = 4.466 units / min i-le0m2 = Σ/60 = e88/6o = 4.8 units / min with a sample mean instead of the average arrival rate approximation , cut Amj = 4.466 \the South to the sample statistics calculations are listed in Table 2. 2IE of a wide 651 one by one wrapped 2 ------ --- T -------- r --- ■ = _-a Dayton real number of pay 'Poisson frequency distribution probability theory to teach l-ji fell two territories, iJPi1E = Plz. Select the number of vehicles per minute fi 00380.175O330.0770.94l015B03182.4S02371.122O. 719.8 lip to take a significant level of d = 0.05, degrees of freedom for the 10-28 check distribution table,[link widoczny dla zalogowanych], ( Super

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. Obedience to traffic recognition saying Qu = 4.5 / min Poisson distribution the same token, may prove to obey traffic north = 4.8 / min Poisson distribution. It should be noted that, in general, road traffic are distributed to meet the Orange Park, therefore, in practice, testing is generally not carried out this step. 3.3 determine the desired length from the construction of <we can see south to the vehicle waiting time will be too much to the north, it is south of decision variables, now (9) transform can be obtained (+1) to = i0 km / tb = time 166.67 m / min, = l5 m, a = 4.5 / min, = 4.8 / min, South = 1O minutes, substituting into the above equation, can be considered as S ≈ 265 米 is the maximum waiting to meet a desired time, the length of each road construction should not be Prince 2, such as rice. To 265 m into (9) can also be obtained by the North to the maximum waiting time is actually due north = 9.19 minutes and the z difference is small in this case, it is desirable in practice = AI-, with (10) to calculate Z The pseudo-calculated results using this method is S = 270 m 4 points that a) This article discusses the sweet is not involved in repair caused by road traffic movements. Considering this factor, in determining the desired maximum waiting time, according to the actual situation in Prince Edward l multiplied by a coefficient, then when the vehicle after the transfer, the average arrival rate will be reduced, this will return the value we want. b) This article discusses the construction of the road does not join the technical and economic constraints. If the specific requirements in this regard on the issue, and to list constraints, such issues are discussed in this article based on the use of mathematical programming solutions.

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