Jam and overheated car

if you decide to by pass jam through the new smart tunnel beware.... if your car is not maintained properly it might overheat. I found this the hard way when I was trapped in a Friday jam within the Smart tunnel. It seemed that hot air generated by all the cars are not efficiently taken out. So, hot air is trapped inside the tunnel. In summary if your car is old do't get studck in a jap in the new Smart tunnel.