Niki Lauda has claimed that Mercedes are hearing the 'alarm bell' to signify their rivals closing the gap on the early pace setters.
The Silver Arrows have dominated the 2014 season to date, with Lewis Hamilton seemingly the only person who can stop his teammate Nico Rosberg from winning the Driver's championship.
The Brackley team have over doubled their nearest rivals points in the Constructor's table (301 to Red Bull's 143), but their rivals are gaining ground and Lauda is concerned.
"The alarm bell is ringing that the competition is coming closer," Lauda said, according to Autosport.
"But if the alarm bell rings in time you can do something. If you sit back, which we don't try to do, you miss out. So what we have to do is keep developing the car."
Williams front row lock out in qualifying for the Austrian GP sent another alert to Mercedes, though they were unable to match Hamilton and Rosberg for race pace. However, Williams suffered a massive setback during practice at Silverstone today when Felipe Massa crashed heavily into a wall.
While it seems unlikely they will be caught, Mercedes will want to avoid being caught on their heels.
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