Despite technological improvements in vehicles and roads, increasing traffic density can bring increased risks, particularly to pedestrians.
In developed countries, where indoor pollution levels are lower, increasing traffic density and elevated NO2 levels with secondary photochemical and fine particulate pollution appear to be the main contemporary problem.
As is to be expected, both, CBP and SBP increase when we increase traffic density and this holds for all of the access network technologies (because of having more IPTV users per cell).
Research is now needed to determine whether antioxidant treatment may be beneficial for children living along roadways with increased traffic density, where asthma prevalence tends to be higher.
A recent community-based study in four communities in the United States demonstrated decreased lung function among middle-age women related to increased traffic density and closer proximity to major roadways (Kan et al. 2007).
Recently, the Atherosclerosis Risk in Communities study, a community-based cohort, showed that increased traffic density and distance to major roadways were associated with reduced FVC and FEV1 among women (Kan et al. 2007).
Increased traffic density and/or proximity to major roadways have been associated with several adverse health outcomes related to the heart and lung (Gauderman et al. 2005; Hoffmann et al. 2007, 2009; Kim et al. 2008; Lipfert et al. 2006; McConnell et al. 2006; Medina-Ramón et al. 2008; Tonne et al. 2007).
However, using traffic as the exposure metric (calculated as traffic density in 50-m residential buffers) revealed a significant risk for increased respiratory symptoms with increasing traffic (OR = 1.58; 95% CI, 1.05 2.38) (Holguin et al. 2007).
Concerns included increased traffic, the density of the proposed development, impact on views and trees, and road safety.
With the increasing of traffic density, the cooperative links are increasing, which is due to the fact that there are more appropriate VEs which can be served as relay vehicles with the increasing of traffic density.
