## $$L^1$$ stability of conservation laws for a traffic flow model.(English)Zbl 0964.35095

The author establishes $$L^1$$ well-posedeness of the Cauchy problem for a hyperbolic system of conservation laws with relaxation $\rho_t+(\rho v)_x=0,\qquad v_t+\biggl({v^2\over 2}+g(\rho)\biggr)_x={v_e(\rho)-v\over\tau},$ where $$g'(\rho)=\rho(v'_e(\rho))^2$$, $$\tau>0$$ is a relaxation parameter. The systems of such kind arise in traffic flows. The continuous dependence of the solution on its initial data in $$L^1$$ topology is proved. On the base of this result the zero relaxation limit is justified. It is proved that a sequence of solutions of the relaxed system converges to a solution of the equilibrium scalar equation $\rho_t+(\rho v_e(\rho))_x=0.$ The author also studies the large-time asymptotic behavior of the equilibrium entropy solutions. In particular the $$L^1$$ stability of the equilibrium shock waves is established.

### MSC:

 35L65 Hyperbolic conservation laws 35B40 Asymptotic behavior of solutions to PDEs 76L05 Shock waves and blast waves in fluid mechanics 35B50 Maximum principles in context of PDEs 35L45 Initial value problems for first-order hyperbolic systems
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