Subjects traffic simulation

Vehicle Arrival A27921

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Vehicle Arrival A27921


1. **Problem statement:** Simulate 1000 vehicles arriving at an intersection on a primary road following a translated negative exponential distribution with average arrival rate $\lambda=0.2$ veh/sec and minimum headway uniformly distributed around mean 2 seconds with range 1 second. Determine minimum headway, arrival headway, and arrival time for all vehicles. 2. **Formulas and rules:** - Minimum headway $t_m$ is uniformly distributed: $t_m = 2 \pm 0.5$ seconds (range 1 second means $\pm 0.5$ around mean 2). - Translated arrival rate: $$\lambda' = \frac{\lambda}{1 - \lambda t_m}$$ - To generate exponential headway $h$ from uniform random variable $u \sim U(0,1)$: $$h = -\frac{\ln(u)}{\lambda'}$$ - Arrival headway $H = t_m + h$. - Arrival time for vehicle $i$: $$T_i = \sum_{k=1}^i H_k$$ 3. **Step-by-step solution:** - For each vehicle $i$ from 1 to 1000: 1. Generate $u_i$ uniformly in [0,1]. 2. Generate minimum headway $t_{m,i}$ uniformly in [1.5, 2.5] seconds. 3. Compute $\lambda'_i = \frac{0.2}{1 - 0.2 \times t_{m,i}}$. 4. Compute exponential headway $h_i = -\frac{\ln(u_i)}{\lambda'_i}$. 5. Compute arrival headway $H_i = t_{m,i} + h_i$. 6. Compute arrival time $T_i = T_{i-1} + H_i$ with $T_0=0$. 4. **Explanation:** - The minimum headway $t_m$ ensures a safety gap between vehicles. - The translated negative exponential distribution models the random arrival times shifted by $t_m$. - Using the uniform random variable $u$ and the formula for $h$ generates the exponential component of the headway. - Summing headways gives cumulative arrival times. **Final answer:** The minimum headway, arrival headway, and arrival time for each vehicle $i$ are computed as above for $i=1$ to 1000.