R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"
Copyright (C) 2013 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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> x <- c(40,40,43,47,47,52,52,52,52,52,53,54,54,54,54,54,55,56,57,57,57,57,58,58,58,58,58,60,61,61,61,61,61,61,62,62,62,62,62,68,68,68,68,69,72,72,74,75,77,88)
> par4 = 'Unknown'
> par3 = 'FALSE'
> par2 = 'black'
> par1 = ''
> xlab = 'x Frequency of Motorists' Occurrence '
Error: unexpected symbol in "xlab = 'x Frequency of Motorists' Occurrence"
Execution halted